uxcell 8mm Bore 11mm Width 40 Teeth Groove Synchronous Timing Belt Pulley Product Name : Timing Pulley;Type : XL;Tooth Number : 40T Screw Hole Dia : 5mm/0.2";Pitch : 5mm /0.2";Pitch Dia : 64mm/2.5" Bore Diameter : 8mm /0.31";Bore Outside Diameter : 50mm /2";Fit Belt Width : 11mm /0.43" Overall Size : 72 x 25mm /2.8" x 1" (D*H);Material : Aluminum Alloy;Color : Silver Tone Weight : 203g;Package Content : 1 x Timing Pulley