Coyote Lug Nuts and Accessories uses only the finest raw materials during production so that you can rest assured you will receive the highest quality product on the market. Every Chrome Coyote lug nut is double nickel plated to surpass 48 hour salt spray test creating a long lasting high luster finish. Coyote's black lug nuts and bolts are coated with black zinc and then with a black paint coating using an electro-deposition process. This process results in a long lasting beauty. Even if the paint chips off during installation, the black zinc remains to insure corrosion resistance and a long lasting black luster. Most Coyote Accessories lug nuts are made from 1008 carbon steel and heat treated to ISO 898-1 class 12.9. Coyote Accessories Spline Lug Nuts, Tuner (SocketLug) Nuts, Wheel Locks and Lug Bolts are constructed from 1045 carbon steel and heat treated to ISO 898 -1 class 12.9. Carbon Steel is an alloy known for its very good formability, comparatively high strength, and a very good surface finish. Class 12.9 Heat Treatment provides high Tensile Strength and excellent mechanical properties to resist the extreme forces being applied during installation and removal. Most Coyote Accessories lug nuts, including spline, are a two piece design. The 2-piece design refers to a thin metal cap on the Lug Nut for added safety. Two piece protects against false torque readings. False torque reading is the result of the wheel stud contacting the inside of lug nut prior to seating with wheel. You can rest assured that you are buying the best when you buy Coyote Accessories!