this roll principle with steel ball , match copper base , aluminium base or resin in order to keep the shelf, arrange in an orderly manner according to certain angle and density. Adopt the circumference of latest cannelure to lock the pearl craft, prevent the copper pearl from coming off. The products have the characteristics that the coefficient of friction is low , the axial , radial can all move , depend on rolling friction , realize having no interval to assemble , has guaranteed to use the precision. Last column the update productses of the suits product,can sports high-speed, used mainly in the cold trimming die and roll in fields such as mould shelf and high-accuracy lathe , lathe attachment ,etc..

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