APPLICATION- Fit for electric screwdriver, manual screwdriver, power drill and other pneumatic or power tools with 1/4" hex holder. Widely used in cars, trucks, engines, motorcycles, computers, cable boxes and other applications.ABOUT THIS PRODUCT- Made of S2 alloy steel, which is a commonly used material in hardware with high hardness.- Sandblasting surface, corrosion resistance and durability.- Magnetic tip, can suck the screws easily when used it.- The hole in the center of each bit causes it to be tamper resistant, designed to prevent Cam-Out the hex bits clicks onto most standard sockets, screwdrivers, drill/driver kits & Power tools attachments.- Exquisite workmanship, each edge can be accurately locked screws, no damage to the screw, and the screwdriver head.