1.[Application]:Gauge Body usually used with calipers,come with 5 bushing are interchangeable,can be replaced for A330,B350,C375,D400,E420.
2.[Function]:Headspace Gage is a great tool for measuring bottlenecks,more accurately measure brass resizing for a accurate reading.
3.[More Accuracy]:Take the neck outside diameter and the shoulder outside diameter and divide that number by 2 to determine which bushing is right for your caliber.
4.[Why you need these Headspace Gauge Bushings]:The handloader oversizes your cases it can lead to excessive headspace problems,which is to shorten the life of the brass.
5.[Package Included]:1 x Gauge body,5 x Bushings Set.We provide 18 months warranty.