Avenger The Avenger/Manfrotto C1575B Super Clamp has strong jaws that open up to 2-1/2", then lock securely with the ergonomic twist handle. It has 1/4-20" female threads on board, a dual locking 5/8" hexagonal female receiver for studs and arms, and 2 wedges are included for clamping onto flat surfaces.
The Avenger Super Clamp is similar to the Bogen version, but it has a locking hex-knob as opposed to a lever.