Description Contains: 3 pieces. 1/4-inch adapter, 3/8-inch adapter and 1/2-inch adapter and each with a set of 1/4-inch hex key adapters. Sockets / socket wrenches / sockets / screwdriver bits to power cordless drills. These adapters are convenient for attaching a socket wrench set / ratchet socket / socket wrench / universal ratchet socket wrench to an electric drill 4 3/8 1/2 socket and 1/4 shank can be converted to 1/4 3/8 1/2 square. Easy to choose: different color-coded rings make it easy to choose the right one. Fits screwdrivers or electric drills with 1/4 keyless chuck system or directly into drill chucks. Transform your hand tool 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 bearing ensures a tight fit in the drive head to prevent slippage during use. Specially machined to fit securely into a portable screwdriver, drill or impact wrench General Purpose: This set of 3 hex shank screwdriver extension rods are designed to meet a variety of needs. Fits individually and securely into your drill chuck or hand screwdriver. Consisting of your most common 1/4, 3/8 and 1/3 bit sizes with alternating shank sizes, it offers versatility and convenience no matter which tool you choose to use. Perfect for DIY, household maintenance and most general repairs, non-industrial work