Groz Engineering Tools [P] Ltd. Manufactures Air Blow Guns and Safety Blow Guns. Groz Engineering Tools [P] Ltd. Is an ISO 9001:2000 certified company. The features of Air Blow Guns and Safety Blow Guns are high impact and weather resistant. The gun Body is made from nylon with a brass threaded insert. The Gun Nozzle, Tubes & Springs are made from Stainless Steel. Gun uses Nitrile rubber seals. The Air Blow Guns and Safety Blow Guns have a soft moulded grip for highest convenience in use & a large Handle for ease of operation. The Air Blow Guns and Safety Blow Guns are designed with a variable speed trigger, the gun allows for Full control of the amount of air dispensed.