... slider, ball, back to the browser, dust cover, Cage, isolation chain.2. Features:(1)High efficiency, the driving ... enforcement oil supply mechanism.(6). Dust cover with the second dust-proof, dust-proof better.(7 ... ). Isolated chain, thus increasing with the amount of grease, there is no friction ... to fight the number of lubricating grease.(8). With Cage, the slider from the rail will not ...