1. All metal material and CNC processing makes it more professional instead of the rubber knob. 2. Within Arca Swiss standard, can be connected within any universal 1/4 screw. 3. Can excellently work with any standard size cameras. 4. Easy operations,no installation tools needed, providing users much more convenience. 5. Perfect for RRS, Arca-Swiss, Kirk, Markins, Wimberley etc. brand quick release plate and other accessories.

http://olla.gr/f2-arca-swiss-quick-release-clamp-adapter-plate-mount-ball-head-lock/