L.E. Wilson CGA-375HH H&H Magnum Adjustable Case Gage, Polished Steel L.E. Wilson Inc. a family owned and operated business since 1927. And the first to produce the Case Gage in 1935 Indicates how much you have sized your case shoulder back Measures min/max Case Length This gage is intended to be used with fired cases to determine a basis for full length sizing and case trimming Made in the U.S.A