*Material: C1022A ，carbon steel 22A
*Head : Frame head & Pan framing head
*Thread : self-tapping thread ，fine thread ,coarse thread
*Drive:Philips drive (PH recess)
*Point : sharp point
Finish:
*Galvanized :white & yellow &white blue ,Nickel plating
*Phosphate :black & gray
*Surface treatment : bright neat body without burr ,sharp thread
*Standard :DIN 7982
*Diameter:3.9mm -4.2mm (#7 - #8)
*Length:19-50mm(3/4"-2")