The Glock knife is a military field knife product line designed and produced by Glock Ges.m.b.H., located in Deutsch-Wagram, Austria. It can also be used as a bayonet, by engaging a socket in the pommel (covered by a plastic cap) into a bayonet adapter that can be fitted to the Steyr AUG rifle. Design The knives were developed in close cooperation with the special forces Jagdkommando (lit. Hunting Command) of the Austrian Army and are suitable for throwing. Both knives have clip point blades made of SAE 1095 carbon steel with a hardness of 55 HRC and are electrophoretic coated. The grips and sheaths of both knives are made of Glock polymer. The grip material has a lower hardness than the polymer used in Glock pistols, avoiding possible problems due to brittleness, but it is also less scratch-resistant. The handle of the Glock field knives was originally available in the colours olive drab, black, gray and desert sand, and currently (2021) in olive drab (international name "battle field green"), black, gray and brown (international name "flat dark earth"). The upper crossguard is bent forward to allow the knife to be used as a bayonet on the Steyr AUG rifle. It can be used as a bottle opener. The polymer sheath features a knife-retention clip, a belt clip for attaching the knife to a belt up to wide and a drainage opening at the bottom. First generation versions of the knives had a circular Glock logo on the sheath, blade, and handle. Later versions have the current Glock logo in the same locations, with "Made in Austria" etched on the blade above the logo. Variants Glock currently manufactures two models of knife: The Field Knife 78 (Feldmesser 78), is a classic field knife, with a long and thick blade, overall length and weighs . The Survival Knife 81 (Feldmesser 81) has the same overall dimensions as the Field Knife 78 with the addition of saw-teeth on the back of the blade and weighs . Commemorative Versions The Field Knife 78 40th Anniversary knife was released to commemorate the 40th anniversary of Glock. It has an olive drab handle and sheath and laser-etched blade, came in a silver Glock pistol case and was released in 2018. 780 of the knives were produced, each of which is numbered. A certificate of authenticity was also included. The Field Knife 78 GSSF 25th Anniversary was