The Flip impact socket combines two sizes in one socket. The socket is designed for use with an impact driver including Klein's compact impact wrench (Cat. Nos. BAT20CW, BAT20CW1). Easy-to-use flip feature allows for quick changes between sizes and reduces the number of tools in the tool bag. Klein® 66077 Flip Impact Socket, 4140 Steel, 6-Point, 7/16 x 3/8 in Socket, 2.625 L x 0.655 H x 0.655 W in