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.