High accuracy bearings and quality parts the printer much more stable and quiet when printing. So this hand leveling nut kit plays an important role in printing, and you don't worry , it only takes a few steps to up. All you have to do is hooking everything up. Features -Color: Black(nuts, screws). -Color: Yellow(Spring). -Material: Metal. -Size: About 4.50X4.50X0.50cm/1.77X1.77X0.20in. -Type: compatible with CR-10/Ender 3 3D printers. - The hand-screwed horizontal nuts are made of metal, which is . - Metal nuts are stronger than plastic nuts and can be twisted more tightly. - Easy installation, horizontal adjustment, does not occupy the effective molding space of the printer. - The torque of is very large, making it easier to fine-tune the hot bed. - The package contains a complete kit, allow you level the printing platform more easily. Package list: 4 x Leveling Nuts 4 x Compression Springs 4 x Screws