The Metro Moulded Parts SM 13, commonly recognized as a sheet metal washer or rubber grommet, seamlessly fits into a 3/4" hole with measurements of 1" outer diameter and 1/2" inner diameter. Crafted with a state-of-the-art rubber compound, this highly durable grommet stands resilient against chemicals, sunlight, and ozone, ensuring long-lasting performance across numerous installs and applications. Featuring a sleek black finish, it pairs functionality with style, offering a clean look whether under the hood or in interior settings. Its slight ridges aid in a perfect fit, providing excellent sealing capabilities while reducing wear and abrasion on inserted components. Achieving a secure installation is straightforward complete most setups without any tools, making it a breeze to use in any project under the sun. Invest confidently knowing it's backed by Metro's leading industry warranty. Enjoy peace of mind with a full 30-year protection and our "No Hassle" guarantee, making the SM 13 not only a wise choice in quality but in service commitment as well. Don t miss out enhance your installations with a product that prioritizes both efficiency and durability today!