Descriptions: These U-shaped bits are made of high quality S2 alloy steel material, which is commonly used material high hardness in hardware. With 1/4 inch hex Shank, they are fitting for electric screwdrivers, hand screwdrivers, electric drills, air drills and so forth.Get this set and make your life easier. Features: These U-shaped bits are made of high quality S2 alloy steel material, which is commonly used material high hardness in hardware. Those bits are magnetic that can be firmly fixed on screwdrivers. The set included 5 different sizes U-shaped heads, so can meet your requirement at an affordable price. Widely used, fitting for electric screwdrivers, hand screwdrivers, electric drills, and so forth. It is useful to operate electronic device, perfect for electrician, mechanic repair work. Specifications: Material: S2 alloy steel Head shape: U Handle: hexagonal shank Handle size: 6.35mm / 1/4" Length: 50 mm/2 inch Specification: U4, U5, U6, U7, U8 Is it magnetic: yes Quantity: 5 PCS Size Lgth.(mm) U4 50mm / 2 Inch U5 50mm / 2 Inch U6 50mm / 2 Inch U7 50mm / 2 Inch U8 50mm / 2 Inch Package Included: 1 x U4 U-shaped Tip Screwdriver Bit 1 x U5 U-shaped Tip Screwdriver Bit 1 x U6 U-shaped Tip Screwdriver Bit 1 x U7 U-shaped Tip Screwdriver Bit 1 x U8 U-shaped Tip Screwdriver Bit Notes: Do not turn the screws with unmatched size, in case get both screw and bit damaged.