Super Quick Fist Clamp

Holds objects from 2.5″ to 9.5″ in diameter. Each clamp supports a safe working load of 50lbs. 2 clamps support 100lbs. Mounts with three #10 bolts or screws. Mounting area: 6″ x 7/8”.
Two good ways to install QUICK FIST clamps are with Jacknuts® or rivetnuts.

Jacknut® Threaded inserts
Jacknuts are a fast and inexpensive way to put a nut into a place where there is no access for a traditional nut. After drilling a hole, the Jacknut is inserted and then tightened with the proper sized bolt. The “legs” of the Jacknut collapse to grip the inside of the mounting surface, leaving a permanent, reusable nut in the hole.

Rivetnuts (best known brand is Nutserts®)
These are nuts that can be riveted into drilled holes. Like Jacknuts these are particularly good to install where the underside of a mounting hole cannot be accessed. To install rivetnuts, you will need a special type of rivet gun or find a garage that will install them for you.