The BRASS CASE GAGES by L.E. WILSON, INC. are made of brass for good corrosion resistance and excellent surface finish, enhancing the gaging of cases.
This one piece gage checks overall length, datum to head length, and assures correct headspace to prevent over sizing, suitable for most popular rimless cases.
Originally designed by Sam (L.E.) Wilson in 1935 for safety, the Cartridge Case Gage helps shooters see the amount of shoulder sizing back on their cases.