Aluminum Alloy Linear Ball Bearing Slide Block Units Light-weight housing and Chromium Steel bearing ball, good abrasion resistance, high precision and good strength Smooth moving, low friction, high rigidity and long working life Suitalbe for kinds of electronic equipment/guide bar, drive shaft, and pillar 1.provides SBRUU series Linear Ball Bearing Slide Block Units complementary to linear ball bearings. 2.They usually consist of a light-weight, Aluminum housing to provide high strength and stiffness. 3.Compact design with High load carrying capacity, Linear Motion Bearing Unit is a rolling friction supporting elements that usually used for linear motion mechanical parts with small friction. 4.Coordinate with Linear Motion Shaft, recirculating balls provide unlimited stroke at low friction movement, permit temperature within 80 degree Celsius. 5.It is great for 3D printer, CNC, and other applications. Product Name : Open Linear Bearing Model : SBR25UU Shaft Diameter : 25mm/ 1 inch Product size: 65*45*60*57mm Color: Silver Material: Aluminum base alloy + bearing steel Package Contents: 1 * Open linear bearing Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.