? Available in a wide range of sizes with different numbers of leaves in various pitch ranges for gaging V, Unified, American National and U.S. Standard 60? threads and Whitworth Standard 55? threads ? All have a locking device at both ends of case for locking any leaf of leaves in desired position ? Leaves on all gages have special narrow design for easy checking of internal threads in nuts, etc. and flatted teeth for checking both V and American National or U.S. Standard threads ? Each leaf stamped with number of threads per inch.