Main Features:
● Surface treatment: nickel plating
● Material: High speed steel HSS4241
● Specification: No.0， No.1， No.2， No.3， No.4
● Handle: Hexagonal shank 1 / 4 Inch (6.35mm)
● Holding power of screw head is stronger
● Apply to electric tools with a clamp or joint， suitable for taking out the screws or bad screw nut from hard wood or wood floor