This Klein Tools' Socket Set includes the 5-in-1 Impact Socket (Cat. No. NRHD) 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-Inch, 1-Inch, 1-1/8-Inch and 2 alignment slots that can be quickly and easily