Used for fastening to a bolt when mechanically joining materials together and preventing loosening from vibration or back off. The hexagonal shape provides increased leverage for use with a wrench during installation and disassembly. Constructed from carbon steel, surface is zinc-plated for good rust resistance. Specification:Material: Carbon SteelSurface Treatment: Zinc PlatedThreaded: G1/2"Hex Width: 27mm / 1.06"Height: 6mm / 0.24" Package Content:5 x Pipe Fitting Hex Locknuts