The Interfit 340 Pro 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.
This clamp includes a snap-in Baby (5/8") pin that will accept many small light fixtures.
INT340 Pro Clamp
Snap-in Baby Pin
One Year Manufacturer's Warranty