Side release Military Buckle essentially consists of two parts, one is male buckle, and the other one is female buckle. They are made of a wide variety of durable materials: POM, Nylon, ABS, PP, PVC, etc. Lighter than metal buckles, they are rustless, so can be applied on life jacket, and strong enough to be used on pet collar & harness, backpack, and sport equipments.
https://www.kjmcobuckle.com/military-buckle/