SincereetaliMaterial: Household Chrome Vanadium Steel - Specification: 1/4" Hex Shank Standard 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 to impact/drive sockets. Included: 3 pieces 1/4" drive adapter, 3/8" drive adapter and 1/2" drive adapter and each with a 1/4" hex socket wrench adapter set. Connector sockets / socket wrenches / sockets / screwdriver sockets to power cordless drills. These adapters are convenient for attaching a socket set / ratchet socket / socket wrench / universal ratchet socket wrench to a power drill. < Purpose: This adapter set is designed to provide a secure lock in addition to your existing tooling. Provides extra length to reach a variety of hard-to-reach spaces. The spring-loaded ball lock ensures a snug fit in the driver head to prevent slipping during use. Specially machined for Fit securely into a handheld screwdriver, drill, or impact wrench. General Use: This 3-piece hex shank screwdriver extension bar set is designed to meet a variety of needs. Fits individually and securely into your drill chuck or handheld screwdriver. Consisting of your most common bit sizes 1/4", 3/8", and 1/3" 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.