ITEM NAME:3 Pcs 50mm 1/4 Inch Magnetic Square Head Tip Screwdriver Drill Bits Alloy Steel Product Description Description: Descriptions: Those Square Head Screwdriver Bits are made of S2 alloy steel which is a commonly used material in hardware Magnetic bits are firmly fixed on screwdrivers 3 sizes a set at an affordable price can meet your requirements Specifications: Brand: JAPAN SEALS Materials: S2 alloy steel Type of shank: 6.35mm / 0.25 inch hex Net weight: (approx.) 35g Dimensions: No. Size of head (mm)    Lgth.(mm) S1    2.4*2.4                50 / 2 in. S2    3.0*3.0                50 / 2 in. S3    3.4*3.4                50 / 2 in. Included: 3 X Square Head Screwdriver Bits.Those Square Head Screwdriver Bits are made of S2 alloy steel which is a commonly used material in hardware. Included: 3 X Square Head Screwdriver Bits. Magnetic bits are firmly fixed on screwdrivers.