90dge Curved 5 Step Block 1018 Steel (Metric Version).

For Thickness And Linearity Calibration Of Curved SurfacesMetric Version:This Metric Curved 5 Step Block Is Machined From A Solid 50.8mm Diameter Bar With Step Thicknesses of 2.5mm, 5.0mm, 7.5mm, 10.0mm and 12.5mm. ID Radius Is A Constant 12.7mm / 25.4mm Diameter.Metric Block Curvature:12.5mm Step Has A 25.2mm Radius,10.0mm Step Has A 22.7mm Radius,7.5mm Step Has A 20.2mm Radius,5.0mm Step Has A 17.7 Radius,2.5mm Step Has A 15.2mm Radius. Metric Step Face: 25mm x 90° arc.