The creator of the lock/latch became frustrated with the latches on the stall doors and how they frequently needed replacing or repair. Not to mention sometimes a horse would get out. Quite the safety concern. After looking in hardware stores and online, but not finding anything HEAVY DUTY, he decided to make his own. After some trial & error he finally came up with what you see. The Cortlock Latch is not brand new. It’s been holding four horses safely in their stalls for over 4 years. No escapes and no problems.