Ridge Mark is one of our newest tools. Much like the original Ridge R-310, this tool allows you to quickly and accurately mark where the fasteners go. Stack the panels on a hard surface, flush the bottom, make one mark on the overlap edge on all the panels where the first-row fasteners will be. Align edge mark and tool mark. Holding the Ridge Mark in place, use a hammer and awl to punch the panel. Swing the adjustable arm out and set to desired spacing. Slide the tool up from the center (the pin will seat in the previous hole). Continue marking the rest of the panel. Put holes in the panels as you normally do.