The Forster 3 in 1 Case Mouth Cutter is designed to save precious time during the reloading sequence. By taking care of three crucial case preparation steps at once case preparation time is significantly reduced. The cutter feature super sharp carbide blades that chamfer both the inside and outside of the case neck while it is being trimmed to the desired length at the same time. Fits: Forster "Original", "Power", Case Trimmer and other trimmers and hand lathes with .490" shaft diameter Notes: Chamfer on the outside of the case neck is 30 DegreesChamfer on the inside of the case neck is 14 DegreesTrim to length