The Gaffer Grips are quick mount, multi-purpose clamps that will grab on most surfaces flat or round. They reinvent the standard spring clamp by adding strength and versatility. The Adjustable Gaffer Grip has one fixed baby 5/8" (16mm) stud and one reversible baby 5/8" stud with both 1/4" __ 20 and 3/8" __ 16 threads on either side. The reversible stud is mounted in a 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 KG500611 jaws can be adjusted from 0.98 __ 2.56" (25 __ 65 mm) and is clad in a stealthy black finish.