The Klein Tools 660KIT2 6-in-1 Color-Coded Impact Socket Set provides users with three square socket sizes for convenience while on-the-job. The included 6-in-1 Impact Socket (NRHD4) provides users with 3/4 in., 13/16 in., 1 in., 1-1/8 in. SAE square socket sizes and 2 alignment slots that can be quickly and easily converted for a variety of utility type applications. This unit also offers twelve socket sizes into six sockets such as 1-1/8 in. x 15/16 in. to 1/2 in. x 3/8 in., ensuring users have the sockets they need for the job.