0.6351"-0.7600" (16.130Mm-19.304Mm) Tool Steel Class Zz No-Go(Minus) Up To 9" Long Custom Reversible Plug Gage Class Zz,No-Go(Minus),Bright Tool Steel Custom Long Length Reversibles From .0151” To 1.0100” Up To 12'' Long (Class Zz Only). Reversible Plug Gages Can Be Furnished In Lengths Up To 12" Long. With The Same Specifications As Our Standard 2" Gages, These Long Members Are Perfect For Gaging Deep Or Hard-To-Reach Holes, Slots And Other Dimensions. Class X, Xx, Y, Z Or Zz. Go, Nogo Or Master Tolerances. Nist Traceable. Certificate Of Accuracy Included. Specify Diameter And Length Of Gage At Checkout. For Example: .2520” X 5.50”. Vermont Gage Usa Part #171509250. At Checkout, In The 'Additional Instructions' Field, Specify The Gage Diameter And Length. For Example: .2520" X 5.50" Long.