self-tapping screw 1.Description: *Din7981:pan head phillips tapping screw *Din7982:flat countersunk phillips tapping screw *Din7983:raised countersunk head tapping screw *Hex washer head self tapping screw *Truss head phillips self tapping screw *pan framing head self tapping screw *pan head slot&phillip self tapping screw 2.Material:Carbon steel/stainless steel 3.surface:zinc,yellow zinc,brass,black oxide available 4.packing:small box packing/bulk packing,DIY packing