This 1/4" (6.4 mm) diameter nail head, high quality black plated 70/30 solid brass, offers extra shine. The detail and craftsmanship will give your articles a true accent. Each spot or nail head has 2 extra-long ¼” (6.4 mm) spikes. Once threw your item, bend the prongs in or out for a secure hold. Thank you for looking and feel free to message with any questions. Made In USA