0.2425" Dia, 2" Long Vermont Gage Class ZZ Minus Pin Gage, manufacturer part number 911424250.
Specifications: Diameter of Measurement: 0.2425 in; Gage Function: No-Go (Minus); Class: ZZ; Tolerance: 0.0002 in; Surface Finish: 10 Micro Finish; Overall Length: 2.0000 in.
Material: Tool Steel. Coating/Finish: Black Oxide. Unit of measure: Inch.