An over center buckle is an excellent tool to use for jobs that required a quick cinch. While less common than ratchet straps and cam buckle straps, an over center buckle is easy to use, and the latch mechanism creates less wear on the strap itself.
The design also allows the webbing to create a layer of padding between the buckle and the cargo. Constructed of a one piece base and lever arm, webbing is wound through the assembly. With the fastener in an open position, the user can feed the excess webbing through the assembly.
Once slack is removed, closing the fastener will add tension to the webbing and hold it in place. Because over the center buckles are slightly more complex to thread than a typical cam buckle, we've created a how-to video demonstration: