• #1 Square drive • Self-countersinking with under head nibs to prevent loosening • Stick Fit square drive recess is deep and cleanly formed eliminating driver bit cam-out • Type 17 sharp self-drilling point drills into all types of wood and reduces wood splitting • Deep coarse threads are uniformly sharp requiring less driving torque • Coated with non-stick clear, dry lubricating film to enhance drivability • Type 305 stainless steel for superior corrosion resistance • Well suited for outdoor projects