Type: button bits, chisel bits, cross bits Model Number: X,XX,EX,EXX,EC,ECC,ESF,ESSF,ESD,ESSD,EY, ... )Business Type: Manufacture and sale2)Min. Order: 2000 pieces3)Type:X,XX,EX,EXX,EC,ECC,ESF,ESSF,ESD,ESSD,EY ... ,EYY Self-drilling Anchor Drill BitSpecification:1)It's the most crucial part 2)It is responsible for the ...