100 Sets Size 16 (7/16 inch) KAMsnaps Lead Safe Open-Ring Cap Gripper Grip Prong Metal Snaps No-Sew Button Fasteners Studs (Antique / Gun Metal Black) 100 complete sets. 1 set = 2 open-ring caps, 1 socket/female, 1 stud/male. Snaps are compliant with CPSC CPSIA standards regarding lead content in children's products. NOT COMPATIBLE WITH THE KAM PLIERS SOLD ON AMAZON (which only work with plastic snaps). Can be installed with KAM table-top professional presses with corresponding dies or KAMsnaps KX6 multi-functional professional pliers. Can also be installed with hammer method, including with Snap Source setter. Approx 7/16" diameter. Cap prongs are approx 3mm long, sufficient for most sewing fabrics but not intended for use with thicker fabrics.