3/8X1 7/8 Magnetic Hex Driver Power Nutsetter Insert Bit (Pack Qty 20) BC-36-165

50BV30 steel (similar to SAE 6150) Rockwell C 42 - 48You may also like 3/16X4 1/2 Concrete Screw Drill Bit Plain (Pack Qty 25) BC-18772BSC.