1.Upgraded Aluminum Hand Twist Level Nut. These red aluminum nuts are original upgraded replacement part for Ender 3/3 Pro/3 X, Ender 5/5 Plus/ 5 Pro, CR-10, CR-10 V2, CR-10 Max, CR 10, CR-10 Mini, CR-10S, CR 10S Pro,CR-10 Plus, CR-X, CR 20.

2. Made by high quality aluminum, last much longer than plastic nuts.

3.Metal nut is more powerful and will twist more tightly than plastic nuts.

4.The torque of these nuts is large, making it easier to fine tune the hot bed.

NOTE: The springs are around 25mm long, which is longer than ender 3 and ender 3 pro printer springs. You can use a tool to cut it to be shorter if you really like this product or adjust the hot bed to be higher to fit the springs.