... ,Aluminum, POM Danly, Hasco, MISUMI, PUNCH, DIN Without MOQ Ball retainer(Ball cages, ball bearing cages)Material: Brass,Aluminum, POMDanly, Hasco, MISUMI, PUNCH ... , DINWithout MOQBall Retainer Bearing with the rolling ball principle, with a copper base, aluminum or resin to maintain the planes, according ... high-precision machine tools, machine tool attachment and other fields. ball retainer