The Hornady Lock-N-Load Modified Case in 6.8mm Remington SPC is specially engineered to work with Lock-N-Load Precision gauges for accurate reloading measurements and chamber analysis.Hornady Lock-N-Load 6.8mm Remington SPC Modified CaseSpecial fine thread attachment for Lock-N-Load Precision gaugesPerfectly square alignment ensures precise chamber measurementRound slightly opened neck for effortless bullet insertionConcentric design for maximum precision resultsEssential for precision reloaders who demand accurate cartridge overall length measurements and chamber dimensions for optimal 6.8mm Remington SPC ammunition performance.