... 3)Type:X,XX,EX,EXX,EC,ECC,ESF,ESSF,ESD,ESSD,EY,EYY Dingrun High Quality Self-drilling Anchor Drill ... gas spring system, shock absorbers, precision instruments, anchoring machinery and construction machinery. JYDR supplies precision tubes and a lot of spare ... most important target..JYDR welcome domestic and overseas customers for Win-Win businesses. Dingrun High Quality Self-drilling Anchor Drill Bit