One-piece non adjustable cylinder-type gage with milled surfaces on one end for checking minimum and maximum overall length of rifle and pistol cases having no shoulder. Measures the Min/Max Case Length - Critical for all Straight Walled Cases This Gage Does NOT Measure Body Diameters - See Pistol Max Gage or Min Dimension Gage Set Case On Flat Surface Slide Gage Over Top of Case (Grooves up) Then Run Straight Edge Over Top of Gage Made In the U.S.A.