--- product_id: 603410932 title: "400/600 Grit 4lb Aluminum Oxide Rock Tumbler Pre Polish, Stage 3 Rock Polishing Grit for Stone Polishing, Compatible with Rotary & Vibratory Tumblers, Premium Lapidary Grit" brand: "mjr tumblers" price: "$99.55" currency: USD in_stock: true reviews_count: 13 category: "Mjr Tumblers" url: https://www.desertcart.us/products/603410932-400-600-grit-4lb-aluminum-oxide-rock-tumbler-pre-polish store_origin: US region: United States of America --- # Stage 3 perfect polish 400/600 grit precision Proudly USA made 400/600 Grit 4lb Aluminum Oxide Rock Tumbler Pre Polish, Stage 3 Rock Polishing Grit for Stone Polishing, Compatible with Rotary & Vibratory Tumblers, Premium Lapidary Grit **Brand:** mjr tumblers **Price:** $99.55 **Availability:** ✅ In Stock ## Summary > 🪨 Elevate your stones to museum-quality shine with every tumble! ## Quick Answers - **What is this?** 400/600 Grit 4lb Aluminum Oxide Rock Tumbler Pre Polish, Stage 3 Rock Polishing Grit for Stone Polishing, Compatible with Rotary & Vibratory Tumblers, Premium Lapidary Grit by mjr tumblers - **How much does it cost?** $99.55 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/603410932-400-600-grit-4lb-aluminum-oxide-rock-tumbler-pre-polish) ## 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 - • **Bulk 4lb Supply:** Ample quantity for multiple polishing projects without interruption - • **Trusted by Experts:** Preferred over mainstream kits for superior polish results - • **Veteran-Owned Quality:** Support a disabled and veteran-owned American company - • **Precision 400/600 Grit:** Engineered for flawless third-stage stone shaping - • **Universal Compatibility:** Works seamlessly with any rock tumbler brand ## Overview MJR Tumblers Premium 400/600 Aluminum Oxide Grit offers a super fine polishing stage for rock tumblers, delivering professional-grade shaping and pre-polish results. Proudly made in the USA by a disabled and veteran-owned company, this 4lb pack ensures compatibility with all tumbler brands and is highly rated for outperforming standard polishing kits. ## Description 4lb of MJR Tumblers Premium 400/600 Pre-Polish Aluminum Oxide Rock Polishing Grit for Step/Stage 3, MJR Tumblers is a Disabled and Veteran Owned Company Proudly Located in USA: desertcart.com: Industrial & Scientific Review: Great company - The best polish. Don't trust the kits on here, you need 8000 and above in final stage to get a good polish. This works really well. Always burnish afterwards to complete the stones. Review: BEST GRIT EVER! - GOOD STUFF! Much better than What National Geographic Sells. ## Features - Premium Quality 400/600 Grit Aluminum Oxide - Compatible with ANY Brand of Rock Tumbler - This Grit is For the Third Stage Shaping of Your Stones - MJR Tumblers is a Disabled and Veteran Owned Company! - Buy American, MJR Tumblers is Proud to be an American Owned Company Located in Pecatonica Illinois in the Good Ole USA! ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CP8VW2T4 | | Best Sellers Rank | #19,482 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #18 in Tumbling Media | | Brand | MJR Tumblers | | Date First Available | December 1, 2023 | | Grit Material | Premium Quality Aluminum Oxide | | Grit Number | 600 | | Grit Type | Super Fine | | Item Weight | 4 pounds | | Manufacturer | MJR Tumblers | | Material | Premium Quality Aluminum Oxide | | Number of Items | 1 | ## Product Details - **Brand:** MJR Tumblers - **Grit Material:** Premium Quality Aluminum Oxide - **Grit Type:** Super Fine - **Item Weight:** 4 Pounds - **Material:** Premium Quality Aluminum Oxide ## Images ![400/600 Grit 4lb Aluminum Oxide Rock Tumbler Pre Polish, Stage 3 Rock Polishing Grit for Stone Polishing, Compatible with Rotary & Vibratory Tumblers, Premium Lapidary Grit - Image 1](https://m.media-amazon.com/images/I/51FmTcNLZ0L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great company *by C***R on October 1, 2025* The best polish. Don't trust the kits on here, you need 8000 and above in final stage to get a good polish. This works really well. Always burnish afterwards to complete the stones. ### ⭐⭐⭐⭐⭐ BEST GRIT EVER! *by T***E on December 22, 2025* GOOD STUFF! Much better than What National Geographic Sells. ### ⭐⭐⭐⭐⭐ Love it! *by A***O on December 11, 2025* This polish made my rocks SUPER GLOSSY! Definitely recommend and I will be purchasing again. ## Frequently Bought Together - 4lb of MJR Tumblers Premium 400/600 Pre-Polish Aluminum Oxide Rock Polishing Grit for Step/Stage 3, MJR Tumblers is a Disabled and Veteran Owned Company Proudly Located in USA - 4lb of MJR Tumblers Premium 120/220 Fine Silicon Carbide Rock Polishing Grit for Step/Stage 2, MJR Tumblers is a Disabled and Veteran Owned Company Proudly Located in USA - 10 lbs Rock Tumbler Grit - Tumbler Media Grit,Rock Polishing Grit Media, Works with Any Rock Tumbler, Rock Polisher, Stone Polisher,COARSE 60/90 Silicon Carbide Grit, Step 1 for Tumbling Stones --- ## 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/603410932-400-600-grit-4lb-aluminum-oxide-rock-tumbler-pre-polish](https://www.desertcart.us/products/603410932-400-600-grit-4lb-aluminum-oxide-rock-tumbler-pre-polish) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-13*