Description Made of aluminium, durable, fine workmanship and high transmission accuracy. Suits to the timing belt. Widely used in milling machine, gear shaper, drilling machine, cnc engine lathe, hobbing machine or other machinery transmission occasions. Contacts with the tooth side which minimizes the risk of the belt slipping. Features - Color: Silver.- Material: Aluminum.- Size: 4.00 x 4.00 x 1.80cm/ 1.57 x 1.57 x 0.71 inch.- Premium fiber reinforeced rubber, durable and flexible, wear resistant for long-term use.- Accurate transmission, without slipping at work, having a constant gear ratio.- The product designed with smooth transmission, a buffer, damping capacity, low noise.- High transmission efficiency, energy-saving effect. Package include, teeth synchronous wheel, belt, screws, allen key.- Widely used in milling machine, gear shaper, drilling machine, hobbing machine or other machinery transmission occasions.Packing list: 2 x 5mm 60 tooth synchronous wheels 2 x 5mm 20 tooth synchronous wheels2 x length 200mm width 6mm belts 4 x screws1 x allen wrench