Sizes included: 1/8, 5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 7/16, 1/2, 9/16, and 5/8″. By grabbing nuts and bolts on all six sides, there is far less chance of rounding fasteners by using sockets compared to open-end wrenches.