1.5101"-2.0100" (38.36Mm-51.05Mm) Chrome Plated Class Y Trilock No-Go(Minus) Gage Member Only Class Y,No-Go(Minus),Gage Member Only Custom Trilock Plug Gage. When You Need To Inspect Large Diameters, Trilock Plug Gages Are Your Best Solution. Much Like Reversible Plug Gages, When One End Wears Out, Simply Turn The Member Around And Continue Gaging. This Significantly Increases The Gaging Life Of Your Gage. Members Are Securely Attached To Your Trilock Handle With Mounting Bolts. Inch Handles – Light Blue. Metric Handles – Yellow. Nist Traceable. Certificate Of Accuracy Included. Vermont Gage Usa Part #192304210. At Checkout, In The 'Additional Instructions' Field, Specify The Size(S) Of Gage Member(S) And The Direction Of Tolerance. For Example: 2.4480" Go And 2.5000" Nogo.