3/16X4 1/2 Concrete Screw Drill Bit Plain (Pack Qty 25) BC-18772BSC

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.