Lortone 33B Rock Tumbler Kit Lortone 33B Rock Tumbler Kit includes rough rock to get you started plus 1 pound of each: 80 coarse grit, 220 medium grit, and 600 fine grit; plus 4 ounces each of Micro Alumina Polish and plastic pellets. Tumbler base dimensions: 6.25"W x 16" L. 3 lb Barrel ID: 4-1/8" Depth, 3-7/8" Dia. Tumbler weight is about 10 pounds. Each molded-rubber barrel has a 3-pound capacity for a total of 6 pounds, perfect for polishing rocks, jewelry, glass or beads. Made in the USA!