Sprag Coupling a with Durable Hardness Range Clutch Warehouse for Textile Machines, Printing Presses, Automotive Industry

VEVOR Rock Tumbler, 2 lb Rock Polishing Machine, Rocks Tumbling Kit with 4-Speed Adjustment, 1–9 Day Timer, PC Sound Reduction Cover & TPU Drum, Direct Drive Motor Rocks Polishing, Quiet Operation

Fistone Rock Tumbler Kit - Noise-Reducing Rock Polisher for Kids & Adults | 5-Day Timer | Great STEM Gift for Young Rock Collectors & Geology Enthusiasts

Thumler's Tumbler A-R2 Rotary Rock Tumbler with Two Barrels

The Young Scientists Club Gemstone Treasures, Tumble & Polish Your Own Gemstones, DIY Rock Tumbler, Collect & Identify Gems, Great STEM Kit for Kids Ages 6, 7, 8, 9, Multi

Leegol Electric 1LB Rock Tumbler – Rotary Rock Polisher with 7-Day Timer

Rebel 17 Rock Tumbler

National Geographic Rock Tumbler Refill Kit - 5 lb. Mix of Rocks for Tumbling and Rough Gemstones - Rock Tumbler Supplies Include Rock Tumbler Grit and Polish Refill, and Unpolished Rocks

Dan&Darci Rock Tumbler Grit Refill Kit - 3.5 Pounds Grits Media + Poly Plastic Pellets - Rocks Polishing Refills for Any Brand Tumblers - Polish Tumbling Supplies Set - Stone Polisher