Haven't received it yet and not exactly a metal working tool. This is a case checker for measuring the bump back on the shoulder of a case for my competition reloading. So since the cases are metal and I am working them, I guess it is metal working of a sort.
It is very difficult to measure a bump of 0.001" on the shoulder of a case. These are suppose to be pretty good and more importantly consistent, which is the name of the game. Once I get it, I will still have to fine tune it with my chamber reamer so that it matches exactly. But that is an easy final step.
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