ITEM NAME:Aluminum Alloy XL Type 40 Teeth 8mm Pilot Bore Screwed Timing Belt Pulley E9Q6 Aluminum Alloy XL Type 40 Teeth 8mm Pilot Bore Screwed Timing Belt Pulley E9Q6 Product Name : Timing Pulley;Type : XL;Tooth Number : 40 Pitch : 5.08 mm / 1/5";Bore Diameter : 8 mm / 5/16";Outside Diameter : 48 mm / 1.89" Fit Belt Width : 11 mm / 0.43";Overall Size : 70 x 25 mm / 2.75" x 0.98" (D*H) Material : Aluminum Alloy;Color : Silver Tone Used widely in milling machine, CNC engine lathe, gear shaper, hobbing machine, drilling machine or other machinery transmission occassions. Weight : 200g Package Content :1 x Timing Pulley Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.