--- product_id: 16249723 title: "Prime-Line U 10378 Bright Brass, Steel Cylinder Guide (Single Pack)" brand: "prime-line" price: "$31.04" currency: USD in_stock: false reviews_count: 8 url: https://www.desertcart.us/products/16249723-prime-line-u-10378-bright-brass-steel-cylinder-guide-single store_origin: US region: United States of America --- # Covers rim cylinder to prevent tampering Weather-resistant brass finish Heavy steel alloy for max protection Prime-Line U 10378 Bright Brass, Steel Cylinder Guide (Single Pack) **Brand:** prime-line **Price:** $31.04 **Availability:** ❌ Out of Stock ## Summary > 🛡️ Lock in security and style—because your door deserves the best guard! ## Quick Answers - **What is this?** Prime-Line U 10378 Bright Brass, Steel Cylinder Guide (Single Pack) by prime-line - **How much does it cost?** $31.04 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/16249723-prime-line-u-10378-bright-brass-steel-cylinder-guide-single) ## Best For - prime-line enthusiasts ## Why This Product - Trusted prime-line brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Precision Fit:** Designed for outswinging doors with exact dimensions—measure twice, install once. - • **Fortify Your Entry:** Heavy-duty steel alloy guards your rim lock from forced entry and tampering. - • **Sleek Brass Finish:** Polished brass plating adds a modern, upscale look while resisting corrosion. - • **All-Weather Defense:** Weather-resistant coating ensures durability through rain, sun, and snow. - • **Easy Secure Installation:** Includes four through-door bolts for a rock-solid, tamper-proof mount. ## Overview The Prime-Line U 10378 Cylinder Guard is a heavy steel, brass-plated protective plate designed to shield rim lock cylinders on outswinging doors from tampering. Weather-resistant and easy to install with included bolts, it offers a durable, polished finish that enhances both security and curb appeal. ## Description This cylinder guard is constructed from heavy steel and comes plated in brass. It features an exterior mounted plate that covers your rim cylinder face from tampering. Includes four through door bolts for additional security. Review: Cylinder Guard Plate for surface deadbolt lock cylinders. - Anyone who has inspected a home and found evidence of tampering with lock cylinders will find this cylinder guard a useful and cost-effective protective measure. Read the product description first to determine this cylinder guard plate fits your application. They install easily when measurements have been taken beforehand, and the instructions are followed. These cylinder guards are substantially made of brass-plated pressed steel plates. Install them properly and they will serve you well. Remember to read the product description, especially the dimensions of the cylinder guard plate. Also measure the lock cylinder(s) on your door, and make sure there is clearance between other locks and door hardware for the cylinder guard plates to fit. Note: If purchasing these cylinder guard cover plates for older style mortised deadbolts, make sure you know the dimensions/location of the mortise lock and mounting hardware INSIDE of the door before you start drilling holes for the mounting bolts. Obviously, you do not want to drill into the mortise lock and destroy it. Also measure how far the lock cylinder extends from the surface of the door, and make sure you have clearance for the Cylinder Guard Cover Plate. Do your preparation first and there should be no problem installing these Cylinder Guard cover plates. Review: Very nice and shiny - Very high quality, well polished. Thank you! ## Features - Used for night lock rim cylinders - Exterior mounted place covers rim cylinder face from tampering - Used on outswinging doors - Heavy steel cylinder guard - Please refer to the line art drawing for dimensions and compare with your needs before ordering ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00D2K33OA | | Batteries Included? | No | | Batteries Required? | No | | Best Sellers Rank | #634,661 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,220 in Screen Door Hardware | | Brand | PRIME-LINE | | Color | Brass | | Control Method | Touch | | Controller Type | Hand Control | | Customer Reviews | 4.3 4.3 out of 5 stars (165) | | Date First Available | May 24, 2013 | | Finish | Brass | | Finish Type | Brass | | Global Trade Identification Number | 00049793103789 | | Included Components | Cylinder guard, and fasteners | | Item Package Quantity | 1 | | Item Weight | 8 ounces | | Item dimensions L x W x H | 0.5 x 3 x 5.87 inches | | Item model number | U 10378 | | Lock Type | Rim Lock | | Manufacturer | Prime-Line Products | | Material | Alloy Steel | | Model Name | Cylinder guard | | Number of Pieces | 1 | | Part Number | U 10378 | | Product Dimensions | 0.5 x 3 x 5.87 inches | | Recommended Uses For Product | Used for night lock rim cylinders, exterior mounted to cover the rim cylinder face from tampering, used on outswinging doors | | Size | 1 Pack | | Special Feature | Weather Resistant | | Special Features | Weather Resistant | | Style | Modern | | UPC | 049793103789 | | Warranty Description | Goods are warranted against manufacturing defects for 1 year. | ## Product Details - **Brand:** PRIME-LINE - **Item dimensions L x W x H:** 0.5 x 3 x 5.87 inches - **Lock Type:** Rim Lock - **Material:** Alloy Steel - **Special Feature:** Weather Resistant ## Images ![Prime-Line U 10378 Bright Brass, Steel Cylinder Guide (Single Pack) - Image 1](https://m.media-amazon.com/images/I/31ynPx4CRJL.jpg) ![Prime-Line U 10378 Bright Brass, Steel Cylinder Guide (Single Pack) - Image 2](https://m.media-amazon.com/images/I/418oCDhbSmL.jpg) ![Prime-Line U 10378 Bright Brass, Steel Cylinder Guide (Single Pack) - Image 3](https://m.media-amazon.com/images/I/513Z5O0id8L.jpg) ![Prime-Line U 10378 Bright Brass, Steel Cylinder Guide (Single Pack) - Image 4](https://m.media-amazon.com/images/I/51SMt96aw7L.jpg) ![Prime-Line U 10378 Bright Brass, Steel Cylinder Guide (Single Pack) - Image 5](https://m.media-amazon.com/images/I/51Srz4J7FqL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Cylinder Guard Plate for surface deadbolt lock cylinders. *by K***T on November 25, 2015* Anyone who has inspected a home and found evidence of tampering with lock cylinders will find this cylinder guard a useful and cost-effective protective measure. Read the product description first to determine this cylinder guard plate fits your application. They install easily when measurements have been taken beforehand, and the instructions are followed. These cylinder guards are substantially made of brass-plated pressed steel plates. Install them properly and they will serve you well. Remember to read the product description, especially the dimensions of the cylinder guard plate. Also measure the lock cylinder(s) on your door, and make sure there is clearance between other locks and door hardware for the cylinder guard plates to fit. Note: If purchasing these cylinder guard cover plates for older style mortised deadbolts, make sure you know the dimensions/location of the mortise lock and mounting hardware INSIDE of the door before you start drilling holes for the mounting bolts. Obviously, you do not want to drill into the mortise lock and destroy it. Also measure how far the lock cylinder extends from the surface of the door, and make sure you have clearance for the Cylinder Guard Cover Plate. Do your preparation first and there should be no problem installing these Cylinder Guard cover plates. ### ⭐⭐⭐⭐⭐ Very nice and shiny *by L***N on June 15, 2024* Very high quality, well polished. Thank you! ### ⭐⭐⭐⭐⭐ Good Addition to Jimmy-Proof Locks *by S***. on August 18, 2019* I bought this product with my Segal SE 15361 Deadbolt. It fits perfectly over the external lock, and looks extremely attractive. I recommend this product to anyone concerned about their lock security. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/16249723-prime-line-u-10378-bright-brass-steel-cylinder-guide-single](https://www.desertcart.us/products/16249723-prime-line-u-10378-bright-brass-steel-cylinder-guide-single) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-21*