The Stahlhelm (steel helmet) is a specific type of German military headgear made of steel, which is primarily intended to provide protection against shrapnel and fragments of grenades. The term Stahlhelm refers both to a generic steel helmet and more specifically to the distinctive German military design. The M1935 design was slightly modified in 1940 to simplify its construction, the manufacturing process now incorporating more automated stamping methods. The principal change was to stamp the ventilator hole mounts directly onto the shell, rather than utilizing separate fittings. In other respects, the M1940 helmet was identical to the M1935. The Germans still referred to the M1940 as the M1935, while the M1940 designation were given by collectors.