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Reticle 27mm Concentric Circles 1mm Increments/Crosshair This Reticle is used for Diameter, Radius, Hole Centering and Concentricity measurements. It can also be used as a Boresigh t and Alignment Reticle.The pattern consists of 10 concentric circles from 1mm to 10mm in 1mm divisions combined with a crosshair. The pattern has a line width of 0.0254mm ± .0025mm with an overall accuracy of .00004”/.001mm.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 27mm Compatibility Chart Full Compatibility Chart Show more