0.5101"-0.8250" (12.96Mm-20.95Mm) Chrome Plated Taperlock Class X No-Go(Minus) Gage Assembly W/Handle Class X,No-Go(Minus),Assembly W/Handle Custom Taperlock Plug Gage. Change Gage Members Quickly. When You Need To Gage Larger Diameters, & Need To Change Or Replace Gage Members Often, Taperlock Plug Gages Are Your Perfect Choice. To Change Gage Members, Simply Pop-Out Existing Members & Press Fit New Members In Your Taperlock Handle. Tool Steel; 60/62 Rc (Cold Stabilized), Chrome Plated Tool Steel; 70/72 Rc. 4 Microinch Finish Or Better On Class Xx, X. Nist Traceable. Certificate Of Accuracy Included. Vermont Gage Usa Part #182205520. At Checkout, In The 'Additional Instructions' Field, Specify The Size(S) Of Gage Member(S) And The Direction Of Tolerance. For Example: .2480" Go And .2520" Nogo. You May Also Include Up To 25 Characters Of Custom Handle Marking At No Additional Charge.