Foamboard rabbet cutter. A very unique and indispensable tool for model makers and display builders. This foam board rabbet cutter is designed to make perfect 90-degree corners and eliminates the exposure of internal foam in the final assembly of prototype models. Order extra RB/R blades shown at right. For use on all types of 3/16" foamboard. #RB316 foam board rabbet joint cutters are made in the USA.