This Rotabroach(tm) HSS Raptor Cutter has the following specification: Diameter: 12mm Cutting Depth: 25mm The Rotabroach(tm) 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.
eBay