HTD3M Timing Belt （ Belt tooth shape: Arc ; Pitch: 3mm）. 12T，14T，15T，16T，17T，18T，19T，20T，22T，24T，25T，26T，28T，30T，32T，35T，36T，38T，40T，44T，45T，48T，50T，55T，60T. ● Fixing grub screw :M3 2 or M4 2 or M5 2 (Free gift) ,Special: For Pulley with more than 30 teeth and less than 8mm bore, the screw is M4.
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