Proto TorquePlus Socket, Deep Length, Series, Yes Impact Rated, Measurement System, Square Drive, Drive Size, in 1, Socket Size, mm 55, 4-1/2 Overall Length, Opening Depth in, in 1-21/64, 2-27/64 Drive End Width, Socket End Width in, in 3-1/4, Side Locking Hole Locking, Number of Points, Bolt Clearance Depth, Alloy Steel, Finish