Review on Screw Chekr Metric Thread Checker by Lamar Marshall

A mechanical manufacturer must first install an SAE/inch gauge screw (#1 - 5/16") - made in the USA and second a metric screw (from 2mm to 7mm) - Made in the USA This Screw Check'r Large Metric Thread Gauge is the third item in the set. Precision tapping holes in thick steel plate has been proven reliable, and tap sizes are printed side-by-side. Unfortunately, some of the labeling is from mine many times came off the SAE gauge I used and I had to rewrite it with a marker There is no hanging hole - you can drill one - but I have my 3 thread checkers handy which are held in place by magnets on the metal cabinet door.