The silver color synchronous wheel is made of aluminum alloy with a high finish. Used in conjunction with timing belts, realize synchronous transmission and transfer project smoothly. Widely used in mechanical transmission such as 3D printers, drilling machines, milling machines, gear machines, CNC lathes, etc. Package Content: 1pcs x Timing Pulley Wheel; Thread: M5*0.8; Teeth: 25T; Pitch: 5mm/0.19inch; Bore Diameter: 6mm/0.23inch; Max Diameter: 45mm/1.77inch; Total Height: 20mm/0.78inch; Slot Width: 16mm/0.63inch; Structure Type: Flat on Both Sides; Shaft Hole Shape: Round The transmission is accurate and stable with high efficiency, there is no sliding when working, it has the functions of buffering and damping, low noise, convenient maintenance, and no lubrication. Has a large power transmission range. It can be used for long-distance transmission. There are two 90-degree countersunk screw holes on the tooth surface, which can be fixed by tightening the screws. If there is a tension pulley, you should loosen it first, and then adjust the center distance after installing the belt. For transmission with a fixed center distance, remove the pulley first, install the belt on the pulley, and then install the pulley on the shaft to fix it. Tips: Screws are not included in the package. ASIN B09TD1V1QQ Item Weight 2.39 ounces Manufacturer MECCANIXITY Item model number mea210724ee0284 Package Dimensions 4.29 x 3.82 x 0.47 inches