The Rotabroach Raptor Cutters have a unique and exclusive geometry. They are designed to ensure that they will last longer, cut faster and give a better and more accurate finished hole than any other annular cutter. The cutters are manufactured from HSS with the addition of aluminium (M2AL), and heat-treated to a high temperature to ensure excellent hardness. This Rotabroach HSS Raptor Cutter has the following specification Diameter 40mm Cutting Depth 25mm