.6351"-.7600" Class Zz Black Guard™ Custom Economy Step Gage, Pin Plus, Step Plus, Single End Assembly, Green Cap Class Zz,Pin(Large) Diameter Plus,Step(Small) Diameter Plus Class Zz +/- .0002" Gage With Light Blue Handle, 1" Step Length, .150" Max Step Diameter Reduction, 2" Long, 52100 Tool Steel 60/65 Hrc, 10 Microinch Finish Or Better, Round Within 1/2 Of Tolerance, Nist Traceable, Certifiacte Of Accuracy Included. Used For Checking Go & Nogo Tolerances Simuataneously Or For Checking Stepped Id's. Vermont Gage Usa Part #921207320. At Checkout, In The 'Additional Instructions' Field, Please Specify The Pin Diameter And Step Diameter. For Example: .1750" Pin And .1680" Step. You May Also Include Up To 25 Characters Of Custom Handle Marking At No Additional Charge.