Dongkun Industry & Trade Co.,Ltd whom engaged in manufacture the precision steel balls and non-steel balls and rollers, and we are the wholesale of all kinds of bearings include the slewing bearings, even we deal in the forklift parts and garage door hardware. Our quality is according to ISO, DIN, AFBMA or customers' requirement, G5 to G1000 is our standard. Also we manufacture according to customers�requirements. For the some of custom-bulit, please send me drawing to develop it.