1/4-14X1 1/2 Slotted Indented Hex Washer 7/16 A/F Self Tap Screw Type AB Full Thread Zinc (Pack Qty 1,250) BC-142407ABSW

A thread forming tapping screw with spaced threads and a gimlet point For self starting in thin (.015-.050 thick) metal or resin-filled plywood. Recommended over a Type-A, particularly in brittle materials