The firm enker operates in holding system of the company energoinvest sarajevo. It was founded in 1973 and a regular production has been starting in 1974. Energoinvest has before produced spark plugs for petrol engines at the other locality on the base of an older technology. That production was organized from 1957 to 1974 what means that energoinvest has been producing spark plugs for over 40 years and there is long years experience. During the first 10 years enker was making spark plugs under license of the English company smith industries limited. Since this license was expired enker has developed its own design following successfully development trend at the other world spark plug producers. Installed factory capacity is 16 millions of pieces per year. Enker produces more than 100 spark plug with different thread sizes: M 10, m12, m14, m18, with flat and conical seats and thread lengths according to ISO standard for spark plugs. They are adopted by their design to engines of automobiles, motorcycles, trucks and buses, agricultural machines, tractors, marine inboard and outboard, chain saws. Also enker produces special spark plugs for aircrafts and armored military vehicles. We are producing spark plugs under two trade names, enker, I. E. Bosna super. Besides standard spark plugs, which are recognizable with Central electrode of nickel-chrome alloy, enker developed by itself and has been producing successfully spark plugs of the higher technological level, such as: - spark plugs with cooper Central electrode - spark plugs with radio interference suppression - spark plugs with several side electrodes (two, three and four) - spark plugs with platinum Central electrode enker exports its products at all five continents throughout the world.