Descriptions: Those Hex Head Screwd Bits are made of S2 alloy steel which is a commonly used material in hardware with high hardness Magnetic bits are firmly fixed on screwds 8 sizes a set at an inexpensive price can meet your requirements Specifications: Materials: S2 alloy steel Type of head: hex Type of joint: 6.35mm / 1/4 inch hex Dimensions: Size Dia. of head (mm) Length. (mm) H1.5 1.5 / 0.06\" 50 / 2\" H2 2 / 0.08\" 50 / 2\" H2.5 2.5 / 0.1\" 50 / 2\" H3 3 / 0.12\" 50 / 2\" H4 4 / 0.16\" 50 / 2\" H5 5 / 0.2\" 50 / 2\" H6 6 / 0.24\" 50 / 2\" H8 8 / 0.3\" 50 / 2\" isi kemasan 8pcs mata obeng magnetic