Material: The socket adapter is made of chrome vanadium steel, which has high hardness, impact resistance, wear resistance and durability. Rounded inside corner design increases contact area and reduces wear. The surface is treated with rust and has a long service life. . Function: Use this chuck converter to convert air or electric impact wrenches into drill bits or ratchet wrenches. They are simple and flexible, and have good performance when using. . Compatibility: The drill chuck adapter can securely attach any 1/4 inch hex shank drill bit, universal electric drill adapter. Compatible with 1/2 inch electric wrench. . Convenient: We use retractable ejector joint design, convenient and firm to replace the drill bit and sleeve. The body is small and easy to use. . Packaging : 2 packs of 1/2" female square to 1/4" female hex adapters. We are equipped with rubber rings and stoppers to use together. .