This is copper based material on which the rollers are arranged orderly in certain angle and intervals. Moreover, the retaining technique is improved that dropping of the rollers can be thoroughly prevented. The friction is low and can move freely both in redial and in axial directions, and the bearing is in high precision. This is a young generation of the roller bearing which can roll in high speed, and is used in rolling frame of cold impact moulds, high precision machine tools and their accessories.  The steel ball array is mainly divided into two categories: spiral array and straight line array.  Ball Cage bushes that are used in mechanical engineering . These Ball Cage bushes are used in injection molding applications and are precisely-made from different grades. Ball cages are made from specially treated solid Aluminum alloy and Brass. Ball Cages are available in standard size and according to customer’s drawing also.