9ESPCONE

Step style cone is capable of measuring 184 of the most widely used sizes in 5 standard cross sections 1/4" I.D. through 5 5/8" I.D.. Slip the O-Ring into the proper slot at bottom of cone to determine the cross section. Then slide the O-Ring onto the proper step to determine the standard imperial size.

O-Ring Sizes Measured:
011 thru 050
110 thru 151
220 thru 255
325 thru 358
425 thru 455