NICE Mahr Plain Bore Cylindrical Ring Gage Smooth # 1.6293 Grade- XX 1.629 This is awesome Ring gage set. This is HARD to find. I do not know much about these or what they go to. Got them at factory overstock sale FREE SHIP ** I have many more of these gages. I will give you a deal if you want multiples. Please see my other listings I have more to List