Longboard Orangatang Kegel 34 Tooth Pulley for 9mm, 12MM and 15mm Belt

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The pre-bored holes are intended for 10-24 tap. If you dont have access to a tap, you can drill these out a little larger using a number 25 drill bit for imperial (.150") which is 3.81mm in metric so 4mm would also work. Once you secure a good fit on your wheels, a small drop of superglue on the threads of the screw is encouraged to prevent the screws from coming loose due to vib