Wilson case trimmers are unique in that the case is held by a case holder which simulates a rifle chamber. Cases are held in case holders by their own body taper. The case holders sit in a rail system that also holds the cutter housing insuring square and perfect alignment every time. Trimmers can be held in a vise or are compatible with the L.E. Wilson Case Trimmer Stand. Trimmers can also be used for inside neck reaming, military crimp removal, and case mouth de-burring by adding additional cutters.