12 LBS Rock Tumbler Grit Set 4-Step Polishing Kit - Bulk Grit Value

In this review of the 12 LBS Rock Tumbler Grit Set, the bottom line is simple: this kit is aimed at hobbyists and small-scale lapidary users who want a large, cost-effective supply of abrasive media for multi-step tumbling. The package contains clearly separated coarse, medium, pre-polish and final polish stages, which makes it easy to follow a standard tumbling sequence, and the large bulk quantities mean fewer refills and lower cost per run. The review focuses on ease of use, material purity claims, and the actual polish results users can expect.

Key Features

• Large Amount of Grit: The 12 lb total supply reduces the need to rebuy frequently and is convenient for multiple batches or larger volumes of stones.
• Four-Step System: Includes coarse 60/90, medium 180/220, fine 500 and 1500 polish so users can run a complete tumbling cycle without mixing products.
• Packaged for Storage: Bottles are easy to store and pour, which helps keep each stage organized and minimizes contamination between grits.
• High Purity Abrasives: The silicon carbide is stated as 99% pure and the aluminum oxide polish as 99.5% pure, which supports consistent abrasive performance.
• Value-Oriented Bulk Packaging: The bulk kit is positioned to save money over buying single small jars, making it attractive for regular tumbers.

Who It's For

This kit is best for hobbyists, rock-club members and DIY lapidary users who run medium to large batches and value cost per run. It fits anyone who prefers a ready-made four-step progression and wants the convenience of labeled bottles.

More advanced bench lapidaries seeking specialized grits for a particular mineral or ultra-high-gloss museum finish may want to compare particle sizes or test a small sample first, as customer feedback on final shine is mixed and some stones come away less glossy than expected.

Pros & Cons

Pros

• Generous 12 lb quantity reduces refill frequency and lowers per-run cost.
• Complete four-step progression simplifies tumbling for beginners and intermediates.
• Well-packaged bottles make staging and storage straightforward and reduce cross-contamination.
• High stated purity of abrasives supports consistent material action during tumbling.

Cons

• Final polish results are mixed; some users report a duller finish on certain stones compared with other polish compounds.
• Those needing ultra-fine or specialized polishes for specific minerals might require additional products.

Specifications

Product	12 LBS Rock Tumbler Grit Set
Kit Steps	4-Step: 60/90, 180/220, 500, 1500
Step #1 Weight	5 lb 60/90 silicon carbide
Step #2 Weight	4 lb 180/220 silicon carbide
Steps #3 & #4 Weight	1.5 lb 500 silicon carbide, 1.5 lb 1500 aluminum oxide
Abrasive Purity	Silicon carbide ~99%, aluminum oxide ~99.5%

Our Verdict

The 12 LBS Rock Tumbler Grit Set is a practical, value-oriented choice for hobbyists who want a full four-step supply and fewer refills. It delivers reliable abrasive stages and convenient packaging, though those chasing an ultra-high mirror polish on every stone may need to experiment with additional polish compounds. Overall it is a cost-effective kit for regular tumbling projects.

Frequently Asked Questions

Will this kit work with any rotary rock tumbler?
Yes, the grit types are standard abrasives and will work in most rotary tumblers; follow your tumbler manufacturer guidance on charge volume and timing.

How many runs can I expect from the 12 lb kit?
Depends on load size, but the 12 lb bulk supply is sized to cover multiple full loads for hobbyist use and reduces the need to repurchase often.

Is the final polish included sufficient for a glossy finish?
The 1500 aluminum oxide polish is suitable for many stones, but customer reports indicate polish quality varies by material; some users may prefer an additional finer polish for maximum shine.