Material: Chrome Vanadium Steel for Household Use Specification: Standard 1/4" Hex Shank Socket to 1/4" 3/8" 1/2" Socket &amp; 1/4" shank can be converted to 1/4" 3/8" 1/2" square head. Suitable for screwdriver or power drill with 1/4" quick change chuck system or directly into drill chucks. Change your hand tool socket sets into impact/drive sockets. Included : 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 / socket bits / screwdriver sockets to power cordless drills These adapters are handy for attaching a socket set / ratchet socket / socket wrench / universal ratchet socket wrench to a power drill.< /p>< Purpose: This Adapter set is designed to provide secure locking in addition to your existing tooling Provides extra length to reach a variety of hard-to-reach spaces Spring-loaded ball lock ensures a perfect fit in the head of the con driver 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 your 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 repair, non-industrial work.