19214 17/64 inch up to 1/2 inch Radius gauge is a very useful gauge for Tool & Diemakers, Machinists, Screw machine operators, Patternmakers, Layout persons and other mechanics to layout and check the radii of tools & dies, patterns etc. Features: 26 leave gauge with locking nut Leaves are specially shaped so they can measure fillets and radii in corners and against shoulders All leaves are marked Specifications: Leaves: 26 (13 Convex, 13 Concave) Range: 17/64 inch - 1/2 inch has been a factory direct distributor of power tools, accessories, fittings and shop machinery since 1986.