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 are designed with an extended shaft to provide additional leverage. These sets are available in both fractional and metric sizes. MayhewSelect 9-piece metric twisted hex key set, engineered for precision and durability, features a unique twisted design for enhanced torque and accessibility in confined spaces Coated with color to resist corrosion Extended shaft design to optimize mechanical leverage and enhance operational efficiency Surpasses ANSI standards Contents - 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm Blister card packaging with thermoformed plastic cavities for secure product display and protection