Keep your wrench in your pocket while hanging lighting instruments with one of these handy gadgets. Add either one to each of your existing C-clamp bolts for wrench-free tightening. When you do need a wrench, just slide the gadget up and out of the way. To install, remove the long bolt from your C-clamp and slide the handle down over the bolt. Then reinstall the long bolt. The Mega Square offers a little more leverage.