Malt muncher 3 roll grain mill specifications: comes with 12 lb hopper and crank handle great for use with a power drill cold rolled steel rollers sized at 5 inch long by 1.25 inch diameter adjustable rollers at both ends to move the gap from 0 inch - 0.63 inch If motorized we recommend 200 Rpm12 TPI knurl to effectively pull grain through the rollers while still leaving the hulls intact to later form an excellent filter during the Sparge12 mm crank shaft.