1、PRACTICAL RETAINER STRUCTURE: Linear motion block is using steel wire retainer structure, effectively prevent steel balls falling off. Practical and safe. 2、POSITION AND AUTOMATIC ALIGNING ABILITY: Linear motion bearing block adopts high position accuracy and comprehensive sealing system. With high load bearing capacity and automatic aligning ability. 3、REPLACED RESPECTIVELY: Our linear motion rail bearing block is in high speed and low noise, also fluent sliding without sticking. The slider or guide rail or even the linear guide rail group can be replaced respectively to regain the guide. 4、LOW FRICTION AND BURR FREE: Linear motion block has low friction and is flexible, no burr and simple to install, friendly to novices. 5、MADE OF BEARING STEEL MATERIAL: Bearing slide block is made of bearing steel, which is perfect for 3D printing, wind, solar, CNC, robot, automation and other equipment.