Common Sense Back Plate 91-BS-78507-1A is a nickel-plated brass fastener designed for durability and rust resistance in outdoor applications. Supplied in a pack of 100, this heavy duty back plate secures multiple layers of marine canvas, upholstery, tents, and outdoor fabrics, making it ideal for boat covers, watercraft seats, gear bags, and luggage. Its positive-locking, spring tension mechanism ensures the fastener stays securely closed and resists accidental opening. Compatible with Common Sense and DOT line hardware, it offers versatile use with numerous matching parts and accessories available. This rust resistant back plate provides a reliable fastening solution for enhancing patio decor and outdoor living setups where strong and corrosion-resistant marine and upholstery hardware is needed.