Material:AluminumColor:SilverFlange: DoubleTooth number: 60Tooth pitch: 2mm/0.07''Diameter of Bore: 8mm/0.31''width of Tooth: 6.5mm/0.25''Height:18mm/0.71''Diameter of Pulley:45mm/1.77''Features:Durable and practicalminimizes the chance of the belt slippingPackage include:1 x 60 Teeth GT2 Aluminum Pulleys 8mm Bore2 x setscrews1 x Allen Key