You are looking at a brand new 10 pack package of Black Line 24 Snaps. This item 1263-03 is a button-type heavy duty snap that is durable enough to last for many years. It maintains a firm grip due to its great socket construction. These snaps have a 5/16" (8 mm) post and a 5/8"(16 mm) cap and base which works well for leather thickness 8 to 10 ounces. They also come in nickel and brass. The Line 24 Snap Setter that goes with it is item #8058-00 or item #3631-00 which is also available in our stecksstore. Please feel free to message with any questions. Thank you for looking.