10 Pcs 5/16 Inch Power Magnetic Nuts Driver Drill Bits 1/4" Hex for Power Tools
Power Nuts Tools Driver Drill Bit For use with hexagonal head self drilling screws. Hex Socket feature magnet for holding the screws in place. Hex Socket Size : 8mm/ 5/16"; Hex Shank Size : 6.35mm/ 1/4".