All hex blades will be S2 steel RC 58/62, black plated. Bit holders CR-V steel, heat treated, bright chrome plated, blades press fit, set screws with thread locker. All drivers are 6" long. Large bold marking for size identification. Limited lifetime warranty Set includes: 1/8", 5/32", 3/16", 7/32", 1/4", 5/16", 3/8" hex blade drivers; 1/8", 5/32", 3/16", 7/32", 1/4", 5/16", 3/8" ball hex blade drivers.