This is a set of 3D printer accessories. Include Synchronous Wheels, Belt, Screws and Allen Key. Provide smooth and accurate transmission. No slipping at work, energy-savingand high transmission efficiency. Suitable for 3D printer, drilling machine,milling machine,etc. Features - Color: Silver. - Material: Aluminum. - Size: 4.00 x 4.00 x 1.80cm/ 1.57 x 1.57 x 0.71 inch. - Package includes 2pcs 2GT 50Teeth Synchronous Wheel, 2GT 20 Teeth Synchronous Wheel, Length 200mm Width 6mm Belt, Screwand Allen Key. - Premium fiber reinforcedrubber, durable and flexible. - Accurate transmission: without slipping at work, having a constant gear ratio. - Smooth transmission: a buffer, damping capacity, low noise. - High transmission efficiency, energy-saving effect. Widely used in milling machine, 3D printer, gear shaper, drilling machine, hobbing machine or other transmission machinery.