90° Curved 5-Step Block (Inch Version) For thickness and linearity calibration of curved surfaces. Inch Version: This 90° Curved 5-Step block is machined from a solid 2" diameter bar with step thicknesses of .100", .200", .300", .400" and .500". ID radius is a constant .50" / 1.00" diameter. Inch Block Curvature: 0.500" step has a 1.0" radius, 0.400" step has a 0.9" radius, 0.300" step has a 0.8" radius, 0.200" step has a 0.7" radius, and 0.100" step has a 0.6" radius. Inch Step Face: 1.000" x 90° arc

90° Curved 5-Step Block (Metric Version) For thickness and linearity calibration of curved surfaces Metric 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, and 2.5mm step has a 15.2mm radius. Metric Step Face: 25mm x 90° arc.