3/16X5 1/2 Concrete Screw Drill Bit Plain (Pack Qty 25) BC-18788BSC

For molded or through holes in thin metal, non-ferrous castings, plastics or resin-filled plywood Screws shall be quenched in liquid and then tempered by reheating to 650°F minimum Steel: AISI 1016 - 1024 or equivalent steel.You may also like 27X1 15/16X1/4 Torx(R) Alternative Power Bit (Pack Qty 20) BC-37-723.