From the product description, check product page for current description, price and availability:

• Roller quantity: 2; roller diameter: 6”x1.5”; roller adjustable range: 0-0.065″
• This grain mill is a sturdy mill with an aluminum hopper that can hold up to 11 lbs of grains at one time
• Barley grinder features an alloy block frame that houses two rollers on stainless steel real ball bearing instead of oil-impregnated bronze bushings
• The drive shaft and all axles are integral to the roller, which makes it possible to drive the Mill clockwise or counter-clockwise
• The grain mill homebrew is perfect for Beer brewing grains, barley, malt, large batches and other high-efficiency milling