Wright Socket, Shape II Standard Length, Impact Rated, Metric, Square Drive, 1/2 in Drive, 16 mm Socket, 38.1 mm OAL, 11.9 mm Opening Depth, 25.27 mm Drive End Width, 25.27 mm Socket End Width, Pin Locking, 6 Points, Alloy Steel, Black Oxide. Wright’s Wide Range of Ratchets Meet Your Every Need: Double-Pawl Ratchets in 3/8 in and 1/2 in Drives Provide Ruggedness, Extra Strength, Durability and Fine Tooth Action. We Also Have The Handles and Attachments You’re Looking For- From Extensions and Spinners to Universals, Flex Handles and The Exclusive Twin Flex.