These Eklind tools are made from Eklind Alloy Steel that is heat-treated, quenched, and tempered for optimum strength, torque, and ductility, ensuring safety. They are coated with a rust-resistant finish for durability. Eklind hex keys (Allen wrenches) are designed to drive internal hexagon socket (Allen head) fasteners. This tool is ideal for mechanics, technicians, and DIY enthusiasts working in constrained spaces.