Made Of Aluminum Alloy ,Strong And Sturdy Double Groove Can Be Applied To Different Speed Requirements Pulley selection: first measure the diameter of the shaft to be installed, such as the shaft diameter of 8mm, and the pulley with an inner diameter of 8mm Outer Diameter For Choosing. Double Groove Can Be Applied To Different Speed Requirements. Wire Rope Pulleys | Next Day Delivery Available Aluminum Alloy Double Groove 50/60MM Pulley Wheel 8-20MM Fixed Bore Pulley For Motor Shaft. 16 sold. US $14.73 Suitable For A Or O Type V-Shaped Pulley Timing Belt. Specifications: Material:Aluminum Alloy Color:Silver Screw:M5 Groove Width:11MM(0., 43) Outer Dia:50/60MM(1., 96/2., 36) Hole Dia:8MM,10MM,12MM,14MM,15MM,16MM,20MM Package Include: 1PCS X Double Groove Pulley (Optional) Outer Diameter For Choosing 50mm 60mm V Belt Pulley Wheel Aluminum Alloy Double Groove Pulley 50/60mm Fixed Bore For Motor Shaft Motor Shaft Pulley Suitable For A Or O Type V-Shaped Pulley Timing Belt