GT2 Pulley AF-type 32~38 Teeth Timing Pulley Bore=4mm~15mm Tooth width=11 mm Keyway width & Qty(pcs):without keyway & 2 NBR also has good resistance

NBR also has good resistance to ozone and weathering for typical outdoor use

and 10 mm cover the most common motor and shaft sizes used in DIY automation

6 mm – 38

but always refer to your vehicle's service manual for the exact specification

GT2 Pulley AF-type 32~38 Teeth Timing Pulley Bore=4mm~15mm Tooth width=11 mm Keyway width & Qty(pcs):without keyway & 2 NBR also has good resistanceGT2 AF Type Timing Pulley Precision 2GT Drive for 3D Printers, CNC & Robotics When your motion system demands repeatable, low backlash power transfer, a poorly matched pulley becomes the weakest link. Engineers, makers, and machine builders who rely on 2GT belt drives need a pulley that holds tight tolerances across every bore size and tooth count without the guesswork of custom machining. These GT2 AF type timing pulleys are designed for exactly that