The STANLEY® Hex Keys on ring Set of 10 pc., has a black phosphate finish for a long life and chrome vanadium steel for strength and corrosion resistance. The anti-corrosion treatment ensures low risk of rust, while the spring fixing allows for easy removal and assembly. The set comes in convenient, hangable and visible packaging, including the most common sizes in one set for convenience and accessibility. All 10 ring sizes are fixed together.