Flexible socket design allows a full 360° of freedom for the universal head to angle and rotate, providing more access to fasteners in tight spaces Forged from premium CR-MO steel, heat treated with durable black phosphate finish, which provides superior strength and corrosion resistance SureGrip drive design drives the side of the fastener, not the corner, to provide increased strength and avoid rounding or damage to the fasteners 8-piece set includes 3/8" drive high visibility impact sockets-5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4" Storage case to keep all these tools organized. High visibility size markings for easy tool identification. Provides great protection, organization, and accessibility for your professional use