Craftsman 12 pc Metric Impact Socket Set 1/2 inch Drive 915887 Socket wall dimensions are optimized to provide strength while providing access to restricted fasteners Includes sizes: 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 24 and 27mm Impact sockets are for use with impact drivers 6 point deep 1/2" drive