Features: These U-shaped bits are made of high quality S2 alloy steel, which is commonly used of high material hardness in hardware. These bits are magnetic which 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 on. It is useful to use electronic device, perfect for electrician, mechanical repair work. Specifications: Material: S2 alloy steel Head shape: U Handle: hexagonal shank Handle size: 6.35mm/1/4Length: 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 screwdriver tip 1 x U5 U-shaped screwdriver tip 1 x U6 U-shaped screwdriver tip 1 x U7 U-shaped screwdriver tip 1 x U8 U-shaped screwdriver tip Notes: Do not turn screws with unmatched size, in case the screw and drill bit are damaged. Note: The data are all manual measurement, please allow 1-3cm error; due of the light and display difference, there would be a certain color difference, please refer to the actual object received.