what's a self drilling screw

Wholesale price sales hexagon Stainless steel drill tail self drill screw

US $0.01

Model:E-1301

Galvanized Hex Self Drilling Screws Roofing Plating Color Hexagon self Drilling Screw for Wood

US $0.01

Model:E-1301

Roofing Screw, Chinese factory direct hot sale all kinds of head type full size Self Drilling Screw

US $0.01

Model:E-1301

HIGH QUALITY STAINLESS STEEL FLAT PHILLIPS HEAD SELF DRILLING SCREW

US $0.01

Model:E-1301