Includes: 3 pieces. 1/4" drive adapter, 3/8" drive adapter and 1/2" drive adapter and each with a set of 1/4" hex socket wrench adapters. Connector sockets / socket wrenches / sockets / screwdriver bits for powering cordless drills. These adapters are convenient for attaching a socket set/ratchet socket/socket wrench/universal ratchet socket wrench to a power drill 4" 3/8 1/2" socket and 1/4" shank can be converted to 1/4" 3/8" 1/2" square head. Easy to choose: different color-coded rings, make it easy to choose good. Fits screwdrivers or power drills with 1/4" quick-change chuck systems or directly into drill chucks. Turn your hand tool socket sets into an impact/drive socket Purpose: This adapter set is designed to provide a secure locking extension to your existing tool. Provides extra length to reach a variety of hard-to-reach spaces. The spring-loaded ball lock ensures a snug fit in the driver's head to prevent slipping during use. Specially machined to fit securely in a portable screwdriver, drill or impact wrench General Purpose: This set of 3 hex shank screwdriver extension bars are designed to meet a variety of needs. Fits individually and securely in your drill chuck or hand screwdriver. Comprised of your most common 1/4", 3/8" and 1/3" bit sizes with alternating shank sizes, it offers versatility and convenience no matter what tool you choose to use. Ideal for DIY, household maintenance and most general repairs, non-industrial work