uxcell Silver Tone Aluminum Alloy XL 25 Teeth 8mm Pilot Bore Screwed Timing Pulley Product Name : Timing Pulley;Type : XL;Tooth Number : 25 Pitch : 5.08 mm / 1/5";Bore Diameter : 8 mm / 5/16";Outside Diameter : 30 mm / 1.18" Fit Belt Width : 11 mm / 0.43";Overall Size : 45 x 25 mm / 1.77" x 1" (D*H) Material : Aluminum Alloy;Color : Silver Tone Weight : 79g;Package Content : 1 x Timing Pulley