Applications: Mainly used for rolling Die Mold and high-precision machine tools, the field of machine tool accessories. Characteristics: With a low coefficient of friction, axial and radial movement. Category: Copper standard steel cage, aluminum alloy standard steel ball cage, ball-type copper special secret to keep Aircraft, POM (plastic) Micronesia special steel cage-type, close-type aluminum alloy special steel cage, (copper, aluminum, POM) spiral steel cage.