SureGrip wrenching design on wrench box ends drives the side of the hex of the fastener, not the corner, to increase torque and avoid edge breakage, especially on rusted or damaged fasteners. Box ends are offset for improved hand clearance in tight work spaces. Set Contains: 6Pt - 3/8x7/16, 1/2x9/16, 5/8x11/16; 12Pt - 3/8x7/16, 7/16x1/2, 1/2x9/16, 9/16x5/8, 5/8x3/4, 11/16x3/4, 13/16x7/8, 15/16x1 Wrenches. Packaged in a roll.