Mounts hotshoe strobes into RRS clamps, but also has 1/4"-20 threaded socket on bottom for installation on any 1/4"-20 threaded post (same thread size as your camera's tripod socket).
100% compatible with Nikon SB-900, and Canon's 580 EX II & 600EX-RT
Use this insulated accessory coldshoe to mount your strobe in any Really Right Stuff clamp. Now you can mount a strobe with ease anywhere you need it.