... ,ESSF,ESD,ESSD,EY,EYY DingRun High Quality Drill Bits1)Business Type: Manufacture and sale2)Min. Order: 2000 pieces3) ... . The products focus on round and profiled cold-rolled precision steel tubes, machinery spare parts. Our manufacturing range ... shock absorbers, precision instruments, anchoring machinery and construction machinery. JYDR supplies precision tubes and a lot of spare parts for global ...