Drill Gauges
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We use these gauges to size the brass stem of the mount before we drill into the case for installation. For a tight fit, choose a drill bit one size smaller than the stem diameter; for an easy fit, choose the same size.
![Drill Gauges](http://www.benchmarkcatalog.com/cdn/shop/products/drill_gauge_large.png?v=1498068264)
We use these gauges to size the brass stem of the mount before we drill into the case for installation. For a tight fit, choose a drill bit one size smaller than the stem diameter; for an easy fit, choose the same size.