Reticle 35mm Thread Gauge, Metric This English Diameter/Thread Gage Reticle is useful for checking the diameters of Drilled and Tapped holes. The diameters gages accurate to ±.00004”.Pattern: Sixteen (16) sets of circles:Drill and tap size measurements to include:M1.0 to M7.0. Outer diameter of tap gauge indicates nominal thread O.D.Reticle is Low Reflection Chrome on a stable glass substrate. The pattern is on the contact surface, right reading looking through.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 drawing 35mm Compatibility Chart Full Compatibility Chart