HOK Lock, which came to life as the first lock company of Turkey in 1946 with the attempts of Osman Küçükkatırcı, a graduate of Kayseri Aircraft Factory Apprenticeship School, and his older brother Halim Küçükkatırcı, started its first production in Kayseri with gas furnace head, iron bolts, padlocks and mortise locks, which were needed in the period. It started in a square meter workshop.