Features:Shank Size: 1/4inch;Bit Dia: 4mm / 0.16inchTotal Length: 50mm / 1.97inch;Bit Type: 4PH2Finish: SandblastingMaterial: S2Package Content: 10 x Phillips Screwdriver Bit Description:These Screwdriver Bits are with magnetic design.Easy to install on the screwdriver handle of the bit shank.Great replacement for missing, bent or broken phillips screwdriver bits.Superior Quality: Those Cross Screwdriver Bits are made of S2 alloy steel, which is a commonly used material in hardware with high hardness.Ideal Magnetic Screwdriver - Those bits fit for electric screwdrivers, hand screwdrivers, electric drills, air drills and so forth