General Tools 251 Screw Pitch Gage, Sizes 4 to 84 General Tools Screw Pitch Gages are finely crafted measuring devices used for gaging V, American National or U.S. standard 60 degree threads Gage is notched for measuring inside threads of small holes and nuts as well as external threads Knurled thumb nuts lock the case in an open or closed position for mess free storage 51 screw pitches combines sizes 4 to 84, including 11-1/2 and 27 pipe thread size