Black Oxide Coated Brass Snap Fastener's Cap Has the long 3/16" Post and Eyelet Has the Long 1/4" Post When purchasing snaps be sure to look for the Fasnap Brand or DOT Brand names stamped into the socket. This will assure you are purchasing a quality product. Anything else may corrode, pull apart easily or break. These Snaps are Guaranteed Top Quality Fasnap Brand Black Oxide Plated Brass - There are a lot of other snap vendors - These are the real deal 100% Money Back Guarantee, if you don't like them for any reason send them back for a full refund and we won't insult you with BS restocking fee's Top quality Black Oxide brass snap fasteners, marine grade, Mil Spec. Heavy-duty construction assures a firm grip that will remain secure through years of use All Black Oxide Plated Brass parts, Excellent Snap action and Holding Strength Snap setting tools available in our other listings if you need one We Ship Internationally! Northwest Tarp Canvas Take a Look Our Quality Tarps! Have a Nice Day!