Ercole M11-001B Spigot Steel Flat Face 1/4?-20 & 3/8?-16 male threads

This Ercole M11-001B Spigot Steel Flat Face 1/4-20 & 3/8-16 male threads has a universal 5/8” diameter and features both 1/4” and 3/8” male threads and a flat face.