Made of chrome steel, good abrasion resistance, high precision and good strength Easy to maintain and replace Smooth displacement, low friction, high rigidity and long life Ideal for 3D printers, CNCs, and other applications Package contents: 1 round flange linear bearing Size: LMF20UU Features: Linear motion sealed round flange ball bearing ring on both sides. Chrome steel shell and ball bearing, good abrasion resistance, high precision and good strength. Smooth travel, low friction, high rigidity and long life. Suitable for all types of electronic equipment, guide bar, drive shaft and pillar. Features: 1. & nbsp; provides LMFUU series round flange linear ball bearings with seals on both sides to prevent the ingress of dirt, water and foreign matter. Linear bearing (also called a ball ring or axis guide) is a friction support element that is generally used for linear motion mechanical parts with low friction. Match them with the linear motion shaft, the recirculating balls provide unlimited movement with low friction, allowing a temperature of 80 degrees Celsius. 4. Ideal for 3D printers, CNCs, and other applications. 5. Size: LMF20UU. Content: 1 linear round flange bearing.