Our exclusive Insert-Pro Rabbeting Shaper Cutter features 2" high carbide knives that produce clean straight edges. It also has four-sided cutters on top and bottom that slice the wood surface for extra clean rabbet cuts. Used with an offset fence as a guide, this cutter is an excellent jointer as well. These carbide spur knives are 4-sided and 4 fit on the Insert-Pro Rabbeting Shaper Cutter, item 84-076.