Product : Pearl Snaps Fasteners Upper part - Top Pearl Prong Size 16, 10.5 mm = 7/16" approx Underparts - Socket, Duo Stud & Prong Ring Size 14, 9.0 mm = 3/8" approx Quantity : 20 sets (20 pcs of each part) Recommend using with our snap setting tool >> search for B07VXRG9W9