5/16-12X3 Phillips Flat Self Tapping Screw Type AB Fully Threaded Zinc (Pack Qty 500) BC-3148ABPF

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