Radius Gage Set Features include... 26 pc Set with Holder + 0.0012" Accuracy Radius Ranges... 0.010" - 0.025" increments of 0.005" 0.030" - 0.100" increments of 0.010" 0.120" - 0.300" increments of 0.020" 0.350" - 0.500" increments of 0.050" Made out of stainless steel and includes holder. Each gage is marked with its radius size Each gage has 5 measuring surfaces for convex and concave radii.