Klein Tools' Penta Hex Flip Socket with Adapter is a must have for all tradesmen. The 13/16-Inch Penta and 3/4-Inch Hex Flip Socket combines two of the most common socket sizes into one tool. The socket is designed for use with an impact driver including Klein's Impact Wrench (Cat. Nos. BAT20CW, BAT20CW1). The 1/2 to 1/2-Inch square adapter includes a ball detent to help prevent unintentional separation from the socket.