Multiple specifications: You will get different sizes including 6mm 7mm 8mm 9mm 10mm 11mm 12mm 13mm 14mm 15mm to help you meet your different needs. Premium Material: Made of Cr-V steel for better impact resistance and higher hardness, it resists abrasion, oxidation and corrosion. Universal Function: 1/4 inch hex shank fits most corded or cordless power drills, heavy duty sockets, magnetic nut locator and can be used with impact driver/drill or ratchet wrenchwith hexagonal socket. Easy to Use: The bell shape and magnetic hex insert allow the bit to stay securely in place for faster installations.The bit features an innovative recessed corner for easier driving into flat surfaces. Widely Used: Our magnetic nut locator is suitable for woodworking even in tight spaces, repairing machinery and auto parts, etc.It is the ideal tool kit for woodworkers, craftsmen, electricians, installers and builders.