Die construction: two-piece die assembly. Die style: two-piece die system. Tool Type: guide. Thread form: UNC/UNF, thread pitch: 20, 28. Thread size: 1/4-inch, thread size equiv: 0.2500-Inch, thread size equiv (metric): 6.35mm. Surface condition: bright. Tool size: a1. Outer diameter: 1.2500-Inch, outer diameter (metric): 31.75mm.