Love the old USA made tools!

1:25:it is a countersink tool intended primarily for aircraft sheet metal. For rivet countersinks. It lets you set the depth for a perfect flush seat for a smooth skin. Most often 1000 degree sink, but 90 and 82 are also available. 4:00- too many mics? I'll see your too many with roughly 400, some for parts, some in repair process, most good and certified traceable cal. That is a nice one.