3 pieces 1/4" drive adapter, 3/8" drive adapter and 1/2" drive adapter and each with a 1/4 inch hex screwdriver socket wrench adapter set. Connector sockets / socket wrenches / socket bits / driver sockets to battery These adapters come in handy for attaching a socket sets / ratchet sockets / socket wrench / ratchet universal socket wrench to an electric drill. Material: Chrome Vanadium Steel for Home Use - Specification: Socket standard 1/4" hex shank to 1/4" 3/8" 1/2" socket 1/4" shank can be converted to 1/4" 3/8" 1/2" square head. Easy to choose from: Different color coded rings make it easy to choose the right one. Purpose: This adapter set is designed to provide a secure lock-in extension to your existing tool Provides additional length, to reach into a variety of hard-to-reach spaces. The spring ball lock ensures a snug fit into the driver's head to prevent slipping during use. Specially machined to fit securely in a hand held driver, drill or impact wrench. General Use: This 3 Piece Hex Shank Bit Driver Extension Bar Set is designed to meet a variety of needs. Fits individually and securely in your drill chuck or hand driver. Comprised of your most common bit sizes 1/4", 3/8" and 1/3" with alternating shank sizes, it offers versatility and convenience whichever tool you choose to use. Great for DIY, household maintenance and most general repairs, not industrial work. Suitable for screwdrivers or power drills with quick change 1/4" chuck systems or directly into drill chucks. Change your hand tool socket sets into a punch/drive sockets.