Features ABS & Steel Material This leveling nut kit is made of high quality ABS and steel material, high strength and wear resistant, and has a long service life. Manual Leveling Nuts Kit:This kit includes an upgraded version of manual rotating leveling nuts, screws and springs, which make the heated bed more stable. Application This hand leveling nut kit is applicable to A8, for ET4PRO, for ET5, for Ender 3 and other models. UPGRADED STRONG SPRING Upgraded rectangular strong spring makes the heated bed flatter and extends the service life. Large Leveling Nut The size of the leveling nut is larger, facilitates the leveling work and improves efficiency. Specification: Item Type: Heated Bed Leveling Nut Nut material: ABS Other material: steel. Application: Applicable to A8, for ET4PRO, for ET5, for Ender 3 and other models Package list: 4 x Heated Bed Leveling Nut 4 x screws. 4 x spring. Package List 4 x Heated Bed Leveling Nut 4 x Screw 4 x Spring