XL Type 50T 60 Tooth BF Synchronous wheel Type:XL Pitch:5.080mm Teeth Number: 50T 52T 54T 56T 58T 60 Tooth Bore:4/5/6/6.35/8/10/12/14/15/16/17/18/19/20/22/24/25/28/30mm Bore 8- Keyway 3x1.4(width x depth) Bore 10- Keyway 3x1.4(width x depth) Bore 10- Keyway 4x1.8(width x depth) Bore 12- Keyway 4x1.8(width x depth) Bore 12.7- Keyway 5x2.3(width x depth) Bore 14- Keyway 5x2.3(width x depth) Bore 15- Keyway 5x2.3(width x depth) Bore 16- Keyway 5x2.3(width x depth) Bore 17- Keyway 5x2.3(width x depth) Bore 18- Keyway 6x2.8(width x depth) Bore 19- Keyway 6x2.8(width x depth) Bore 20- Keyway 6x2.8(width x depth) Bore 22- Keyway 6x2.8(width x depth) Bore 24- Keyway 8x3.3(width x depth) Bore 25- Keyway 8x3.3(width x depth) Bore 28- Keyway 8x3.3(width x depth) Bore 30- Keyway 8x3.3(width x depth) Material:Aluminium Alloy Fit for Belt Width : 15mm Pulley Package :1pcs Use For : CNC machine Synchronous Belt Pulley;3D printer Transmission Pulley;DIY machine Gear. If you don't find the right number of enamel or installation bore when you position an order, you would contact us on to tailor it for you, welcome to consult.