These jar mills are ideal for grinding laboratory or high-purity samples. High-quality, powder-coated finish protects the exterior from oils, solvents, and chemicals. Mills provide quiet, smooth operation with the 1/12-hp, direct-drive DC motor. Easy to clean and maintain, these lab mills require no tension adjustment or lubrication. Rollers and brackets are easily repositioned and secured by convenient allen-head bolts. Rollers measure 12-5/8" (32.1 cm) in length and accept jars from 2" (5.1 cm) to 10" (25.4 cm) in diameter. Maximum capacity of 30 lb (13 kg).