Reticle 21mm Inch/Metric Scales, Inch Hole, Line Width Gage Reticle Patterns on this gauge are useful for checking distances, hole diameters and line widths.Patterns:Hole Diameter Gauge: 1/64”, 1/32”, 3/64”, 1/16”, .005”, .010”, .020”, .040” and .050” Diameter.Metric Scale: 0 to 10mm in 0.20mm increments.English Scale: 0 to 0.50” in .005” increments.Line Widths: .002” to .007” in .001” increments.All Patterns are right reading looking through the glass so that the pattern can be in direct contact with the object to be measured. The Reticle Pattern is very durable, double layer, deposited evaporative Chrome/Chrome Oxide, for a reflectivity of less than 5% looking at the pattern.The Patterns on all Reticles manufactured by Max Levy are replicated from Precision Chrome on Glass Tooling under clean room conditions. Click here to download the drawing.