The Leofoto FA-16+FA-10 Cold Shoe and Hot Shoe Adapter is a unique flash adapter that can be attached to an Arca-Swiss rail.
You can effectively create a Cold Shoe Quick Release connection to an Arca-Swiss Rail, or a Leofoto L-Bracket.

Simply turn the centre knob on the Leofoto FA-16+FA-10 Cold Shoe and Hot Shoe Adapter to be able to widen the clamp, simply lock it in place on the Arca-Swiss clamp by tightening the knob again. The Loefoto FA-10 can then easily slide in using the V-Type Quick Release Plate with an attached accessory such as a LED light, Microphone or flash.