Features: It can be used with both manual and electric screwdriver. Suitable for disassembling screws in various situations, such as plugs socket, fuses box, and electrical appliances. Make of Tool Steel materials, these screwdriver bits is highly enduring and resistant to wear and tear. Each screwdriver bit in this set measure 50mm in length, making it easy to access screws in deep or narrow space. Use: Electric drills, hand electric drills, pneumatics batches. Specifications: Materials: Tool Steel Single length: about 50mm/1.97inch Package Includes: 5Pcs Square Head Driver Bit note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.