The BCHN12 is a stainless steel nut-lock type ball transfer unit featuring a 12 mm head diameter and a 5.56 mm main ball diameter, designed for smooth multi-directional item movement. Model BCHN12 Brand ZH Material Chrome Steel precision P0 P6 P5 P4 Product Description The BCHN12 is not a traditional rotary ball bearing, but a ball transfer unit, commonly known as a "glove ball" or "bull's eye wheel." It is mainly used in conveyors, automated machinery, and workbenches,