1. An excellent replacement for lost, bent or broken pentagon screwdriver bits.2. Made of S2 alloy steel, which is a high-hardness material commonly used in hardware. The magnetic tip can easily hold the screw when in use. Exquisite workmanship, each edge can accurately lock the screws without damaging the screws and the screwdriver bit. The hole in the center of each bit is tamper-proof and is designed to prevent Cam-Out the bits click onto most standard sockets, screwdrivers, drill/driver kits, and Power tools accessories.3. Widely used in DIY hand-making, household appliances, precision instruments and most general repairs.4. Can be used for electric screwdrivers, manual screwdrivers, electric drills, air drills, etc.5. Notice: Do not turn the screws with mismatched size to avoid damage to both the screw and the drill.