---
product_id: 693996681
title: "400/600 Grit 3lb 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: "$80.55"
currency: USD
in_stock: true
reviews_count: 13
category: "Mjr Tumblers"
url: https://www.desertcart.us/products/693996681-400-600-grit-3lb-aluminum-oxide-rock-tumbler-pre-polish
store_origin: US
region: United States of America
---

# 400/600 grit precision Universal tumbler compatibility Proudly USA made 400/600 Grit 3lb 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:** $80.55
**Availability:** ✅ In Stock

## Summary

> ⚡ Elevate your rock polishing game with precision grit made in the USA!

## Quick Answers

- **What is this?** 400/600 Grit 3lb 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?** $80.55 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/693996681-400-600-grit-3lb-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

- • **Smart Storage:** Packaged in heavy-duty ziplock bags for easy portioning and long-lasting freshness
- • **Universal Fit:** Seamlessly compatible with any rock tumbler brand—no limits, just results
- • **Stage 3 Perfection:** Premium 400/600 grit aluminum oxide for flawless pre-polish shaping
- • **Community Connection:** Join a passionate rock hounding community via exclusive MJR Tumblers social channels
- • **Veteran-Owned Quality:** Support a disabled and veteran-owned business with every purchase

## Overview

MJR Tumblers’ 3lb Premium 400/600 Aluminum Oxide grit is engineered for the critical third stage of rock polishing, delivering super fine shaping compatible with all tumbler brands. Proudly crafted by a disabled and veteran-owned company in Illinois, this product combines top-tier quality, smart packaging, and community engagement to ensure your stones shine like never before.

## Description

3lb 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 Product Line and Attention to Detail - I recently placed an order for 4lbs of step 3 pre-polish aluminum oxide from MJR Tumblers, and was pleasantly surprised that each lb was separated into 4 heavy duty ziplock bags. This allows me to store just wants needed in my storage ben, while keeping my extra product in the semi air tight bag which it was shipped in. I was also impressed with there product line, I struggled to find 400 to 600 grit in the aluminum oxide on desertcart, but I am happy MJR Tumblers turned out to be the only one I could find, because i plan on making more orders with this company😊 they also sent some great literature along with my order, including knowledge of there FB page I can join and share my passion with other Rock Hounders🥰 Thank you for this service AND a Special Thanks for your Service 🫡100% satisfied customer!!!
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.

## 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 | B0CP8WRHLJ |
| Best Sellers Rank | #11,469 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #18 in Tumbling Media |
| Brand Name | MJR Tumblers |
| Compatible Material | Premium Quality Aluminum Oxide |
| Customer Reviews | 4.5 4.5 out of 5 stars (466) |
| Grit Material Type | Premium Quality Aluminum Oxide |
| Grit Number | 600 |
| Grit Type | Super Fine |
| Included Components | Instructions and Grit |
| Item Weight | 3 Pounds |
| Manufacturer | MJR Tumblers |
| Material Type | Premium Quality Aluminum Oxide |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** MJR Tumblers
- **Grit Material:** Premium Quality Aluminum Oxide
- **Grit Type:** Super Fine
- **Item Weight:** 3 Pounds
- **Material:** Premium Quality Aluminum Oxide

## Images

![400/600 Grit 3lb 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)

## Available Options

This product comes in different **Size, Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Product Line and Attention to Detail
*by J***K on March 13, 2026*

I recently placed an order for 4lbs of step 3 pre-polish aluminum oxide from MJR Tumblers, and was pleasantly surprised that each lb was separated into 4 heavy duty ziplock bags. This allows me to store just wants needed in my storage ben, while keeping my extra product in the semi air tight bag which it was shipped in. I was also impressed with there product line, I struggled to find 400 to 600 grit in the aluminum oxide on Amazon, but I am happy MJR Tumblers turned out to be the only one I could find, because i plan on making more orders with this company😊 they also sent some great literature along with my order, including knowledge of there FB page I can join and share my passion with other Rock Hounders🥰 Thank you for this service AND a Special Thanks for your Service 🫡100% satisfied customer!!!

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Extra fine grit
*by B***E on February 23, 2026*

This is the extra fine grit you need for stage 4 or even stage 5 to provide extra polish to your tumbled media. It provide a great shine.

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**Shop now:** [https://www.desertcart.us/products/693996681-400-600-grit-3lb-aluminum-oxide-rock-tumbler-pre-polish](https://www.desertcart.us/products/693996681-400-600-grit-3lb-aluminum-oxide-rock-tumbler-pre-polish)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-23*