This Klein Tools Socket Set includes the 5-in-1 Impact Socket and the 2-in-1 Slotted Impact Socket Set, 6-Piece (Cat. No. 66090). The versatile 5-in-1 Impact Socket features three square socket sizes: 3/4 in, 1 in, 1-1/8 in and 2 alignment slots that can be quickly and easily converted for a variety of utility type applications. The 6-Piece Impact Socket Set consists of commonly used impact socket sizes used in utility and construction work. Includes two 3-in-1 sockets with an alignment slot to tighten and loosen most pole hardware.