The Kupo Large Gaffer Grip is a quick mount, multi-purpose clamp that will grab on most surfaces flat or round. Kupo Gaffer Grips reinvent the standard spring clamp by adding strength and versatility. The Large Gaffer Grip is outfitted with a variable tension control knob and comes with a long removable baby 5/8" (16mm) pin mounted in a female baby 5/8" (16mm) receiver. If you're looking for a rapid, down and dirty way to mount a lighting fixture, the Gaffer Grips are always willing and able. The Kupo Large Gaffer Grip jaws can be adjusted from 1/4" to 3-1/8" (0.63-7.93cm) and is clad in a stealthy black finish.