OKIL Door Fixing Work Safety Lock System was developed by Haluk ATEŞER, a teacher. In the years 2010/2014, Defne-San Ltd. is a family owned company. Sti. was established in 2014, has been established in 2015 Ateşer Lock systems Energy, Construction, Food, Commitment. Singing. And Tic. Ltd.

Our products are produced in two regions.
In order to meet the needs of Marmara, Aegean and Mediterranean regions of Turkey;
Production is carried out in Ankara Ostim to meet the needs of Central Anatolia, Black Sea, Eastern Anatolia and Southeast Anatolia regions.