Features CR-MO alloy steel: made of high quality CR-MO alloy steel, wear-resistant and durable, high strength and extend the service life APPLICATION This socket is versatile for all 1/2 inch hand wrenches as well as power and pneumatic tools PREVENT DAMAGE The nut base is protected by a shell that prevents damage to highly polished wheels and nuts PERFECT TOOL With different colors, easy to identify, the nut driver is the perfect tool for wheel change Easy to carry: equipped with a convenient storage box, small, convenient to carry and easy to store Specification: Item Type:Lug Nut Socket Set Material: CR-MO alloy steel. Inner diameter of square hole: 1/2 inch. Inner diameter of the hex hole: approx. 17 mm / 0.67 inches, 19 mm / 0.75 inches, 21 mm / 0.83 inches. Package list: 3 x wheel nut socket set. 1 x plastic box. Note: Ensure good safety protection when using Package List 3 x Wheel Nut Socket Set 1 x Plastic Box