Brass Stud Earring Findings, with Perforated Disc Settings and Earring Backs/Ear Nuts, Flat Round, GoldenSize: about stud earring: 13mm long, 3mm thick, tray: 12mm, pin: 0.8 mm; perforated disc setting: 12mm in diameter, 2mm thick, hole: 1.2mm; earnut: 3x5mm.