Ujjdwiurgh 5Mx6Mm Timing Belt +4Pcs 20 Tooth 5Mm Inner Diameter Pulley +4Pcs Idler + 4Pcs Tensioner Spring Torsion +2Pcs Gear Clamp Mount and Hex Wrench for 3D Printer

Pulley: It's used together with timing belt, very convenient to use. 20 Teeth contact with the belt, that minimizes the chance of the belt slipping. Mounting Block: The mounting block is used in open belt buckles for 2GT belt (and some other models). Make sure that the is firm and free from loosening. Timing belt: The timing belt is made of premium rubber, and flexible. It's designed specifically for linear motion, high positioning accuracy. Round tooth profile guarantees that the belt tooth fits smoothly. Locking Spring: With the springs, you can add the right tension you need and make your prints much more precise. Compatibility: compatible with most 3D printers. Attention: Small parts, keep away from children!