The Sinclair/Starrett Case Neck Wall Thickness Micrometer is a precision measuring instrument designed specifically for ammunition reloading and case preparation.Sinclair/Starrett Case Neck Wall Thickness MicrometerPrecision measurement of brass case neck wall thicknessEssential tool for consistent ammunition reloadingProfessional-grade Starrett quality and accuracyDesigned for serious reloaders and competitive shootersThis specialized micrometer ensures consistent case neck wall thickness measurements helping reloaders achieve optimal ammunition performance and accuracy for precision shooting applications.