5/16-12X2 1/2 Phillips Flat Self Tapping Screw Type AB Fully Threaded Zinc (Pack Qty 750) BC-3140ABPF

For self starting in thin (.015-.050 thick) metal or resin-filled plywood. Recommended over a Type-A, particularly in brittle materials Screws shall be quenched in liquid and then tempered by reheating to 650°F minimum