SpecificationsHead Type: Hex Head; Hex rod: 6.35mm (1/4 inch); Total length : 50 mm (2 inches); Quantity : 8pcs 8 Sizes(Hex Head Inner Diameter): H1.5 (1.5mm), H2 (2mm), H2.5 (2.5mm), H3 (3mm), H4 (4mm), H5 (5mm), H6 (6mm), H8 (8mm) Material DurableHigh-strength S2 alloy steel bit, high hardness and high torque, wear-resistant, stable performance Strong MagneticEasy to lock the screws when using, the screwdriving bit does not damage not screw and screwdriver head, improve your work efficiency Wide ApplicationSuitable for electric and hand screwdriver, electric drill, pneumatic drill. Ideal tool for household appliances, precision instrument industry, furniture industry The 8 in 1 professional size screwdriver bit set can meet your different needs. These screwdriver bits hex bits are made of S2 alloy steel, high hardness, overall heat treatment, high torque and good toughness. Strong magnetic screwdriver bits, easy to suck screws when using, convenient to use, improve the efficiency of your work. Exquisite workmanship, each edge can be precisely locked, without damaging the screw and screwdriver head. Suitable for installation in pneumatic screwdrivers, electric screwdriver, rechargeable drill, using the wind lot. Widely used electric tools, electric screwdriver assembly, electronics industry, household appliances, precision instrument industry, industry screw equipment. ie of the furniture. Warm tips Do not turn the screws with unmatched size, in case the screw and drill bit are damaged. Specification Material: high quality S2 alloy steel. Head type: Hexagon Hexagon shank: 6.35 mm / 1/4 inch Length: 50mm / 2 inch Size: H1.5:Hex Head Diameter: 1.5mm H2:Hex Head Diameter: 2mm H2.5:Hex head diameter: 2.5mm H3:Hex Head Diameter: 3mm H4:Hex head diameter: 4mm H5:Hex head diameter: 5mm H6:Hex Head Diameter: 6 mm H8:Diameter of the hexagon head: 8mm