Name: HTD 8M Timing PulleyMain Material: Aluminum AlloyType: BF TypeTeeth Pitch: 8mmBelt Width: 25/30mmGroove width: 27mm/32mmTeeth Number: 50T 60TBearing Bore : 12/19/20/22/24/25/28/30mmKeyway Bore:12mm-keyway 4mm19mm-keyway 6mm20mm-keyway 6mm22mm-keyway 6mm24mm-keyway 8mm25mm-keyway 8mm28mm-keyway 8mm30mm-keyway 8mm30mm-keyway 10mmPack Quantity:1pcs