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Double-Ended End Mills: What Are They and When Should You Use One? When selecting an end mill, getting the right cutting geometry is only part of the equation. Tool reach, rigidity, flute count and overall value can all affect which option makes the most sense for the job. For many shallow milling applications, a double-ended end mill offers a practical advantage: two usable cutting ends on a single tool. Once one end reaches the end of its usable life, the tool can be flipped to provide a fresh cutting end. That sounds simple—and it is—but double-ended end mills aren’t automatically ..