The Manfrotto Superclamp is a studio staple for a reason: it's sturdy, reliable, easy to use, and multi-purpose. It'll grab boards, pipes, flashes and more, and features a 1/4" threaded socket and a light stand stud receiver with a security lock. It's a good clamp! Good working order, minor cosmetic wear.
Image is for illustration purposes only. Actual items will vary.