These Eklind tools are made from Eklind Alloy Steel that is heat-treated, quenched, and tempered for optimum strength, torque, and ductility, ensuring safety and durability. Coated with a rust-resistant finish, these hex keys (Allen wrenches) are designed to drive internal hexagon socket (Allen head) fasteners. This tool delivers professional-grade performance for mechanics, technicians, and hobbyists alike.