Chrome Vanadium steel for professional use Hardened and tempered for superior strength and improved durability Super strong acetate handles resist impact and chemicals Integrated cushion grips provide all day comfort and increased torque Chrome plated for superior corrosion resistance Hex bolster allows use of a wrench for increased torque Hollow shaft fits over long fasteners Socket size permanently embossed on handles for easy identification in tool pouch Convenient plastic carrying case keeps nut drivers organized