Installation: Insert the same diameter drive shaft according to the wheel aperture,Locking screws, easy to install. UKCOCO Timing Pulley High Precision Aluminum Alloy 60 Teeth 8mm Bore Timing | UK MXL Timing Pulley 20 Teeth 8mm Bore Aluminum Alloy Timing Pulley, Suitable For 8mm Bore Aluminum Pulley XL Type Aluminum Timing Belt Pulley 20 Teeth 8mm B... – Vicedeal Material: Aluminum alloy; Precision machining, smooth; The rounded teeth on this Aluminum 60T GT2 timing pulley and belt stay connected longer, making movement smoother and improving performance in 3D printers Parameters: Bore: 8mm; Number of teeth: 60; Applicable belt width: 10mm; Tooth Pitch: 2/25 (2., 032mm); Material: Aluminum alloy; Precision machining, smooth; Style: MXL (shoulder style); Package contents: Screws X 2pcs; Wrench X 1pcs; Synchronous wheel X 1pcs Installation: Insert the same diameter drive shaft according to the wheel aperture,Locking screws, easy to install.