Features: brand new- and made of high quality material, durable for 2020 aluminum profile X-axis belt stretch tensioner. Very usful upgrade parts for series printer, you can adjust the belt freedom, more better than original Widely used for CR10 CR-10S Ender3 3D printers etc Already assembled,you don't need to assemble it by yourself Specifications: Name: for 2020 Aluminum Profile X-Axis Synchronous Belt Stretching Tensioner Material: Plastic Size:approx 6.2x2.2x2.6cm/2.44x0.87x1.02in Package Includes: 1PCS Belt Stretching Tensioner note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.