The Kupo Large Gaffer Grip made by strudy yet lightweight aluminum alloy is a quick mount multi-purpose clamp that will grab on most surfaces flat or round. They're invent the standard spring clamp by adding strength and versatility. This 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. The jaws can be adjusted from 1/4" to 3-1/8" (0.63-7.93cm) and has a black finish.