This is a small side-release buckle or parachute buckle. I use them as a quick-release mechanism for my bicycle keys but you can use them for other situations.
You need to use supports under the Male Key Buckle part.
Every make will be featured on my Instagram add your handle and follow me :) Check out my Instagram if you want to see more designs like this or if you have questions!
Do you want to support me or become a reseller of my designs? Go take a look at my Patreon!
More of my designs:
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.