Stainless steel components, precisely CNC machined, designed for compatibility with the Redding case neck gauge and flash hole deburring tools. These pilot stops are engineered to accurately fit both new and resized case necks, featuring a distinct shape With a subtle undercut design, this shape minimizes the pickup of imperfections at the case mouth or neck/shoulder junction, ensuring precise and smooth indicator readings with the new case neck gauge Two size options are provided due to the utilization of small (9/64 inches) mandrels, specifically designed for .17 Cal and .20 Cal applications, accommodating the reduced flash hole dimensions The expanded dimensions (compatible with standard 3/16 inches mandrels) maintain optimal performance across tools from various manufacturers