TTW Guide: a groove or ridge of metal or other material that supports, anchors, guides, and reduces friction on a moving device or device. A longitudinal groove or ridge on the surface of a guideway for guiding or fixing machine parts, special equipment, instruments, etc. . The guide rail is also called the slide rail, the linear guide rail, the linear guide rail, uses in the linear reciprocating movement occasion, has the higher rated load than the linear bearing, simultaneously may bear certain torque, high precision linear motion can be realized under high load. Guide rail is mainly divided into two categories of roller guide rail and ball guide rail.