Radius gauge is used to measure die pattern tools etc to check the radius even a round shanks , Radius of Leaves Included(mm) : 1 mm, 1.25 mm, 1.5 mm, 1.75 mm, 2 mm, 2.25 mm, 2.5 mm, 2.75 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm,7 mm Quantity of Leaves : 34.0 The radius measurement is usually in metric form and measured in mm(millimeter). The material used is entirely made up of stainless steel, but a layer or finish of satin chrome can be added since it keeps the radius gauge corrosion free and gives them more rust resistance. The blades used are of the concave and convex shape. It may be swung out of the holder case when necessary readings need to be taken as per the requirement.