Sturdy, durable Beaver (TM) arbors are ideal starter units & can be equipped as complete cabochon machines, 2 wheel or 4 wheel models are available in both 6" & 8" diameters. Both feature an easy maintenance design of welded-steel construction, polymer finish, & rubber mounted sealed ball bearings. 3/4" threaded shafts accept silicon carbide or diamond wheels, rubber expanded drums & polish heads at either end. Choose the combination of accessories for the type of work you perform. Requires either an overhead water drip system or in-pan coolant squirter. Wheels & motor not included.