Common Sense Turn Button Double Height w/Two Screw Holes 91-XB-78323-1A is a nickel-plated brass fastener designed to securely lock fabric to surfaces, perfect for marine, automotive, and outdoor uses. Featuring a double height design with two screw holes, this 100-pack provides a rust- and corrosion-resistant twist lock fastening solution that keeps thick or layered fabrics firmly in place in fresh or saltwater environments. Its durable nickel finish ensures longevity, making it ideal for upholstery, canvas, boat covers, luggage, and other outdoor fabric hardware applications requiring a reliable locking fastener.