This set of 12 round plugs is designed to fit 3/4 inch tubes with an outside diameter of 0.584 inches. The plugs are made from a combination of Pex B, polyethylene, and poly alloy materials, making them corrosion-resistant, smell-proof, and rust-resistant. The set includes stoppers and is perfect for use in plumbing and fixture applications. Whether you're a professional plumber or a DIY enthusiast, these plugs are a great addition to your toolkit.