Materials: S2 alloy steel. Made of high quality, durable and strong S2 steel, a material commonly used in hardware. Strong Magnetic: These screwdriver bits have strong magnetism which can attract and hold screws firmly. Hex Shank: 6.35mm (1/4inch): With 1/4 inch hex shaft, they are widely used on electric screwdrivers, hand screwdrivers, cordless drills, etc. Various bit designs : there are five sizes of screwdriver bits of TA 1.8/TA 2.0/TA 2.3/TA 2.7/TA 3.0 in this set.Scope of application: the shaped screwdriver bit can drive screws into appliances such as vacuum cleaners, fan heaters, elevators, camping stoves. Quantity delivered: 1 game Our products are made with the splendid quality materials and are designed to provide you with the best possible user experience.