Experienced manufacturers know that when milling, three main considerations predominate: metal removal rate, tool life, and surface finish. All three are critical to successful metalworking, but often one will predominate. Manufacturers facing parts requiring 90-degree shoulders also know that achieving true 90-degree shoulders and minimizing the scallop or step marks between passes absolutely requires a high-performance cutter. The new Mill 4-15 platform from Kennametal is that best-in-class system, according to the company.