Rifle headspace case gages assist in proper size die adjustment and in checking cases for whether they need to be trimmed. Essential for long case life especially with semi-automatic firearms! Made of stainless steel for long life.
I returned this even though I am a complete Dillon fan. It was 100 percent inaccurate, it tests for maximum standard not minimum. Ever single case passed in this guage and every single one would not seat in my weapon. The Hornady is better but not perfect, I am waiting on a Lyman.