Mayhew twisted hex key sets are constructed from high-quality S2 tool steel. They undergo a twisting process before heat treatment to enhance torque capacity and feature an extended shaft for increased leverage. These sets are available in both fractional and metric sizes. MayhewSelect 9-piece sae twisted hex key set, engineered for precision and durability, featuring ergonomically designed handles and high-torque performance for optimal user efficiency Coated with color to resist corrosion Extended shaft design to optimize mechanical leverage and enhance operational efficiency Surpasses ANSI standards Contents - 1/16 inches, 5/64 inches, 3/32 inches, 1/8 inches, 5/32 inches, 3/16 inches, 1/4 inches, 5/16 inches, 3/8 inches Blister card packaging with thermoformed plastic cavities for secure product display and protection