These handy snap extensions allow you to add 1" Inches quickly and easily to your boat cover. Great for boat covers that are a little too tight or that have shrunk over the years. Made from heavy duty nylon webbing and Fasnap Brand stainless steel snaps. Snaps will not rust or corrode and hold tighter than the nickel plated brass snaps. Designed for salt and fresh water environments. Another great product from the leaders in innovation and marine canvas design. Northwest Tarp & Canvas specializes in working with boat designers and owners in producing top quality products. Questions? Send us an e-mail here on Amazon. We respond to all e-mails within 24 hours and usually much sooner. Northwest Tarp & Canvas - Bellingham, Washington