Uxcell Timing Pulley Product name : timing PULLEY; Type : Xl17; Number of tooth : 17t Pitch : 5.08Mm/1/5&#39; &#39; ; bore diameter : 6Mm/0.24"; top diameter : 20Mm/0.78" Overall size : 31 x 25Mm/1.2&#39; &#39; x1&#39; &#39; (d*h); fit belt width : 11Mm/0.43" Materials : aluminum; color : Silver tone Weight : 37G; Package Content : 1 x timing PULLEY