Holey I-beam clamping jig is quick to convert

Sometimes a clamping job requires more than your workbench for stability. This simple jig provides many options for challenging clamping tasks, such as securing a piece standing on edge. It also serves as a bench riser, putting the workpiece at a more comfortable working height, and can be used in the "H" position or the "I" position depending on your needs.
—Jim Moorehead, Barrigada, Guam