1" Screw Stud 10 Piece Set. The male portion of this snap is compatible with all Line 24 3/8" snap fastener caps & sockets. The 1" screw on this stud is great for you need more grabbing power from a screw or when you need to go through several layers of fabric like on a padded chair or bench. Questions? Please don't hesitate to contact us here on Amazon via e-mail. We respond to all inquiries within 24 hours and usually much faster. Northwest Tarp & Canvas - Bellingham, Washington