Compatible Models: Gauge Body come with 5 bushing are interchangeable, fit for A330, C375, D400, B350 and E420
Function: Headspace Gage is a great tool for measuring bottlenecks, more accurately measure brass resizing for a accurate reading
Premium Material: Made of premium quality materials, high reliability and accuracy, tested several times before leaving the factory, meeting even exceeding OEM standards
How to Determine: 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
After-sales Service: If you have any problem, please communicate with us and we will reply in 24 hours