NOTE - The length of the springs is about 25mm, which is slightly longer than ender 3 series printers (including ender 3/ender 3 pro/ender 3 v2). The springs need to be cut shorter than the original ones in order to fit the printer or adjust the hot bed to be higher to fit the springs. Suitable for - Upgraded aluminum manual twist level nuts are original upgraded spare part for Ender 3/3 Pro/3 V2/3 Max, Ender 5/5 Plus/ 5 Pro, CR-10, CR-10 V2, CR-10 V3, CR-10 Max, CR 10, CR-10 Mini, CR-10S, CR 10S Pro, CR 10S Pro V2, CR-10 Plus, CR-X, CR 20. Metal Material - Metal material is stronger, it will twist tighter than plastic nuts. Easy to Use - The torque of these nuts is large, making it easy to fine-tune the heatbed. Quality - Made of high quality aluminum, lasts much longer than your stock plastic nuts.