These precision CNC-machined stainless steel pilot stops are purpose-built for use with the new Redding Case Neck Gauge and Flash Hole Deburring Tools. Expertly designed to fit both new and resized case necks, they feature a uniquely undercut shape that eliminates interference from imperfections at the case mouth or neck/shoulder junction. This ensures smooth, precise indicator readings when paired with the Case Neck Gauge. Comes in two sizes, the smaller option is tailored for 9/64 inches mandrels, ideal for .17 and .20 Cal cases with small flash holes, while the larger size accommodates standard 3/16 inches mandrels and is compatible with tools from other manufacturers. Combining versatility and reliability, these pilot stops are an essential addition for meticulous handloaders.