This Steelmax offering is a 13 piece or 7 piece premium annular cutter set available in 1″ & 2″ depth of cut. These annular cutter sets give you a complete system to handle the most popular hole-making jobs. Utilizing the carrying case also helps maintain the life of the annular cutters. Steelmax HSS (High Speed Steel) cutters utilize an M2Al (aluminum additive) formulation which increases cutter life due to better heat propagation characteristics and a less brittle character compared to other M2 formulations, such as those using a cobalt additive.