This set converts any combination square or set having blades up to 1" (25mm) wide into a height gauge or depth gauge. In addition to a clamp block, the set has a scriber, 6" rule and a 6" (150mm) rod, any one of which may be inserted in the clamp and locked in position. By applying the scriber, a practical height gauge results. Use of the rule converts the tool to a depth gauge for measuring in 1/64" of an inch. With the rod used as a depth gauge, small recesses and holes can also be checked.