The DOT Durable Plastic Cover Mariner Cap 93-XV-10150-1X Black comes in a 100 pack and features a UV-resistant black plastic cap paired with a strong self-piercing brass eyelet designed to match standard all-brass DOT Durable buttons. This medium-sized fastener provides durable snap action and secure holding power, capable of piercing thick marine canvas and upholstery fabric without pre-punching holes. Made in the USA, it is suitable for use on boat covers, awnings, tents, umbrellas, gear bags, luggage, and industrial curtains, offering weatherproof, rust-resistant performance ideal for outdoor furniture, marine hardware, and heavy-duty fabric fastening needs. Its compatibility with sockets, studs, and posts makes it a reliable choice for enhancing patio decor and outdoor living spaces with marine-grade, long-lasting quality hardware.