.0040"-.0250" Tool Steel Class X Go(Plus) & No-Go(Minus) Gage Pin Assembly, Double End Handle With Green & Red Caps Gage Memebers Are 2" Long, Tool Steel, Cold Stabilized, 60/65 Hrc. 4 Microinch Finish Or Better. Round Within 1/2 Of Tolerance. Nist Traceable. Certifiacte Of Accuracy Included. Standard Class X(.00004" To .8250", .00006" For .8251" & Up) Go(Plus) Only, No-Go(Minus) Only Or Go & Nogo Assemblies. Available In .0001” Sizes. Specify Gage Size(S) & Direction Of Tolerance(S), Either Go (Plus) Or No-Go (Minus). Class X Go/Nogo Assemblies Are Economical & Very Versatile For Gaging. A Great Go/No-Go Inspection Tool; If The Go (Green End) Fits & The Nogo (Red End) Doesn't, Your Part Passes Inspection. It Doesn't Get Any Easier! Certificate Of Accuracy Included. Vermont Gage Usa Part #151101330. At Checkout, In The 'Additional Instructions' Field, Specify The Size(S) Of Gage Member(S) In .0001" Sizes And The Direction Of Tolerance. For Example: .1251" Go And .1258" Nogo. You May Also Include Up To 25 Characters Of Custom Handle Marking At No Additional Charge.