One operation , Save money, Easy to use
The application of the self-drilling screws is to drill and tap into steels for building and construction. No pre-drilling polit hole needed. Self-drilling screws are composed of TY ASD, BSD, or CSD with point #2, #3, #4, #5, and #6 depending on the thickness of metal sheet to make it perfectly on operation, money saving, and use.
S=M3~M8,#5~5/16
L=9~300mm,3/8"~12"
Point:#1~#6 Wings