Screw Checker for Inch Sizes

This is a unique tool every modeler should have these days. When you can't figure out what size or thread the screw is, just size it with the hole on the left (for the correct diameter) then thread it into the proper thread hole to the right and you have your screw identified. This checker is for Inch sizes from No. 1 to 5/16" and tells you drill sizes also. THESE PLATES ARE MADE OF CHROME PLATE STEEL. MADE IN USA!