RS PRO 6.35 mm, 9.52 mm, 12.7 mm Square Adapter Set The RS PRO square adapter set contains seven pieces, designed to give you more flexibility with your impact tool. The three universal joints in 1/4-inch, 3/8-inch and 1/2-inch drive sizes are hinged to give you the ability to work in confined spaces. The four adapters mean you can use your existing impact tool with different-sized sockets and drives. The seven pieces in this set are made from chrome vanadium steel and have a black powder coat finish for added strength and durability. The set comes with a red plastic socket rail for convenient storage. The RS PRO adapter set conforms to US and European ANSI/ESD S20.20:2014 and BS EN 61340-5-1:2007 electrostatic control standards. It’s used in applications that require a square socket type and is suitable for use with impact tools such as air ratchets, impact wrenches and air impact drills. Features and Benefits - 7-piece square adapter set - For use with impact tools - Drive sizes of 6.35 mm, 9.52 mm and 12.7 mm - 3 impact universal joints with 1/4-inch, 3/8-inch and 1/2-inch drive sizes - 4 impact adapters in sizes 1/4-inch (F) x 3/8-inch (M), 3/8-inch (F) x 1/4-inch (M), 3/8-inch (F) x 1/2-inch (M) and 1/2-inch (F) x 3/8-inch (M) - Chrome vanadium steel construction - Black powder coat finish - Supplied with plastic socket rail - Conforms to ANSI/ESD S20.20:2014 and BS EN 61340-5-1:2007 Electrostatic Control Standards