0.5761" Dia, 2" Long Vermont Gage Class X Plus Pin Gage, manufacturer part number 141157610.
Specifications: Diameter of Measurement: 0.5761 in; Gage Function: Go (Plus); Class: X; Tolerance: 0.00004 in; Surface Finish: 4 Micro Finish; Overall Length: 2.0000 in.
Material: Tool Steel. Unit of measure: Inch.