Heavy duty 1/4" impact tool bits. Manufactured from heat treated S2 grade steel for high durability and long life. Professional quality screwdriver bits for trades people, DIY, joiners, electricians, builders, home improvement, repair, maintenance. Designed for high-powered drill drivers and impact drivers. Available in multiple tool types including Hex/Allen, Pozidriv, Philips & Star/Torx. Corrosion resistant, anti-rust black phosphate coating. Suitable for continuous high torque and heavy use applications.