High accuracy bearings and quality parts the printer much more stable and quiet when printing. So this platform knob plays an important role in printing, and you don't worry , it only takes a few steps to up, it is very easy and you just need about few mintues to build. All you have to do is hooking everything up. Features - Color: Assorted Color. - Material: Plastic, metal. - Size: 3.80X3.80X0.50cm/1.49X1.49X0.20 inch. - The product with upgraded leveling nuts of large size make leveling easier. - Made of material, sturdy and , for long time to use. - Easy to install and remove, no tools required. Lightweight, easy to carry and use. - The product used for leveling the heated bed or platform, and make them more stable. - Hand leveling nuts, make the hot bed become more stable. Package list: 4 x nuts 4 x screws 8 x springs