They have both concave and convex radius on each leaf Large Radius Gauge Set 9/16"-2" Made of .049 thick stainless Set is from 9/16" to 2 " radius by 1/16th of inch increments There are two sizes on each leaf,convex and concave, there are 12 leafs Gauges are laser cut, with sizes cut into each leaf Tolerance-Unspecified-visual aid Made in USA