Precision CNC machined stainless steel for use with the Redding Case Gauge and the Flash Hole Deubrring Tools. Designed to properly fit new and resized case necks, these pilot stops feature a very unique shape. Slightly undercut, this shape will not pick up imperfections at the case mouth or neck/shoulder junction resulting in smooth accurate indicator readings when used with the Redding Case Neck Gauge. Two sizes are available because of the small (9/64") mandrels used for .17 & .20 cal. and small flash holes. The larger size (for standard 3/16" mandrels) work equally well with the tools of other manufacturers.