6-20X1/4 Indented Hex Unslotted Self Tapping Screw Type A B Fully Threaded Zinc (Pack Qty 10,000) BC-0604ABH

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