You get hardware to use the Box Clamps two different ways. You can rest it flat on a table (or even mount it) or change the clamping bolt, add a knob and use it as a hand-held clamp on the upper sections of your project. The change from one mode to the other takes just seconds, so don’t think you’re married to one way or the other. Imagine being able to dry-fit and square up all your parts at the same time without any bulky clamps and before having to use any glue, screws or nails. You'll know right from the start if what you're building will assemble to the final dimensions, be as square as you need or if minor trim cuts are necessary. These clamps work great on butt joints, miters, dadoes, rabbets, T-joints, dovetails and box joints…even when material overhangs the joint face. Its open design lets you easily nail or screw along the full length of the joint.