This is copper or aluminum or plastice based material, on which therollers are arranged oderly in certain angle and intervals. Moreover, the retaining technique is improved that dropping of the rollers can be thoroughly preventedThe friction is low abdcan move freely both in axial directions, and the bearingis in high precision. This is a oung generation of the roller berinf which can roll in high speed, and is used in rolling frane of cold impact moulds, high precision machine tools and their accessories
