The patented SureGrip wrenching design drives the side 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: 6 Pt - 3/8x7/16, 1/2x9/16, 5/8x11/16 Packaged in a pouch.