--- product_id: 99197438 title: "Rock Tumbler Grit Kit Refill for 18lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers" brand: "mjr tumblers" price: "$74.32" currency: USD in_stock: true url: https://www.desertcart.us/products/99197438-rock-tumbler-grit-kit-refill-for-18lb-tumblers-4-step store_origin: US region: United States of America --- # 12,000 grit sub-micron polish Premeasured 4-stage grit system Proudly USA made, veteran owned Rock Tumbler Grit Kit Refill for 18lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers **Brand:** mjr tumblers **Price:** $74.32 **Availability:** ✅ In Stock ## Summary > ✨ Polish Like a Pro, Shine Like No Other! ✨ ## Quick Answers - **What is this?** Rock Tumbler Grit Kit Refill for 18lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers by mjr tumblers - **How much does it cost?** $74.32 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/99197438-rock-tumbler-grit-kit-refill-for-18lb-tumblers-4-step) ## Best For - mjr tumblers enthusiasts ## Why This Product - Trusted mjr tumblers brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Veteran-Owned Quality:** Support a disabled and veteran-owned American company with every purchase. - • **Expert Guidance Included:** Step-by-step instructions with pro tips ensure your best polish every time. - • **Unmatched Extreme Polish:** Experience the finest 12,000 grit aluminum oxide for a mirror-like finish. - • **Effortless 4-Stage System:** Premeasured grits for seamless use in any 18lb rotary or vibratory tumbler. - • **Complete Rock Tumbling Kit:** Includes coarse, fine, pre-polish, and exclusive extreme polish for flawless results. ## Overview MJR Tumblers' Refill Grit Kit delivers an industry-leading 12,000 grit sub-micron aluminum oxide polish, engineered for 18lb rock tumblers. This premeasured 4-stage silicon carbide and aluminum oxide system guarantees unparalleled shine and ease of use. Proudly made in the USA by a disabled and veteran-owned company, it includes expert instructions to elevate your rock tumbling experience. ## Description Full description not available ## Features - Extreme Polish! Every rock tumbling kit from MJR Tumblers comes with our Exclusive 12,000 Grit Sub Micron Extreme Aluminum Oxide Polish! No other polish even comes close to our results. If you want the best, MJR Tumblers 12,000 Grit Aluminum Oxide Extreme Polish is what you need! - MJR Tumblers is a Disabled and Veteran Owned Company! - Premeasured and works with all rotary and vibratory tumblers. All 4 Stages are premeasured for your tumbler, just pour and roll! It Can’t get easier than that! - Each 18lb kit contains the following: 18oz of course 60/90 silicon carbide grit, 18oz of fine 120/220 silicon carbide grit, 9oz of pre polish 400/600 silicon carbide grit, 9oz of MJR Tumblers Exclusive 12,000 grit Extreme Aluminum Oxide Polish - MJR Tumblers is Proud to be an American company located in Pecatonica Illinois in the good ole USA! - Includes easy to understand rock polishing instructions with lots of tips and tricks with every purchase from MJR Tumblers! ## Product Details - **Material:** Aluminum Oxide, Plastic Pellets, Silicon Carbide - **Grit Material:** Aluminum Oxide; Silicon Carbide - **Item dimensions L x W x H:** 8 x 6 x 1.5 inches - **Brand:** MJR Tumblers - **Grit Type:** Coarse; Fine; Pre Polish; Polish ## Images ![Rock Tumbler Grit Kit Refill for 18lb Tumblers, 4 Step Silicon Carbide & 12,000 Grit Aluminum Oxide Polish, Stone Polishing Kit for Rotary & Vibratory Rock Tumblers - Image 1](https://m.media-amazon.com/images/I/61aeQRPy1vL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Does the polish give the rocks a shiny wet look?** A: yes but if you have a glaze on your stones, clean of the polish and re-run with plain water and ivory soap. This will get you the wet look you are seeking **Q: How do i convert oz into tbsp? i have a 1 lb tumbler and it says to add 1oz of grit, how many tablespoons is that?** A: 1 tbs is half a fluid oz. Generally I add about 1 tbs of grit per pound on steps 1 and 2, and half that for steps 3 and 4. Hopefully this helps. --- ## 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/99197438-rock-tumbler-grit-kit-refill-for-18lb-tumblers-4-step](https://www.desertcart.us/products/99197438-rock-tumbler-grit-kit-refill-for-18lb-tumblers-4-step) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-14*