Feature: 1. Easy Installation: The twist lock fasteners are made from zinc alloy and come in a convenient pack of 20 sets. With the provided tools, you can securely install the fasteners to keep your canvas in place 2. Robust Design: The tarp grommet fasteners, button holes, and screws offer a stable way to securely mount canvas or other materials to surfaces. The included installation screws allow they stay sturdy for longer 3. Adjustable Tension: The innovative twist lock mechanism grips materials tightly without any tools, allowing for easy 2 part fastening and adjustable tension. They provide a secure and tight lock to keep your canvas in place 4. Versatile Use: Ideal for tents, water proof fabric, and more, these fasteners can be used on wood, metal, hard plastic, and composite materials. Suitable for a variety of applications, they are a valuable addition to any tool kit 5. Secure Locking: The marine canvas fasteners fasteners are designed to provide a firm and secure lock, ensuring your fasteners stay in place without accidentally loosening. Protect your marine canvas snap fasteners and fastenings with ease Specification: Item Type: Twist Lock Fasteners Material: Zinc Alloy Weight: Approx. 170.00g / 6oz Turn Button Fastener: Approx. 18 x 30 x 6 x 12mm / 0.71 x 1.18 x 0.24 x 0.47in Rings: Approx. 20 x 25mm / 0.8 x 1in Murphy Fastener: Approx. 8.5 x 14.5 x 27mm / 0.33 x 0.57 x 1.06in20. Package List: 20 Sets x Turn Lock Fasteners (100pcs)