Size: 2-9/16" Long X 1/2" Wide 51 Screw Pitches Combines Sizes 4 To 84, Including 11-1/2 And 27 Pipe Thread SizeFinely Crafted Measuring Device Used For Gaging V, American National Or US Standard 60 Degree ThreadsGage Is Notched For Measuring Inside Threads Of Small Holes And Nuts As Well As External ThreadsKnurled Thumb Nuts Lock The Case In An Open Or Closed Position For Mess Free Storage