DIYers and repair pros, this 300-piece pack of aluminum rivet washers is exactly what your toolbox has been missing! These are backup washers designed specifically for 3/16 inch diameter rivets, with an inner diameter of 3/16 inch (4.76mm), outer diameter of 1/2 inch (12.7mm), and thickness of 0.06 inches (1.5mm). Made from quality aluminum, they're corrosion-resistant and won't rust, making them perfect for marine applications, outdoor equipment, or any environment where moisture is a concern. They work with blind rivets to provide extra support when fastening softer materials like leather, plastic, rubber, wood, or laminates - the washer distributes the pressure so the rivet doesn't pull through the material. But they're not just for rivets! You can use them with other fasteners too for various repair and fabrication projects. Think boat repairs, trailer maintenance, race car builds, aircraft work, custom metal projects - basically anywhere you need a little extra reinforcement behind your fasteners. The aluminum material is easy to work with and doesn't add much weight. With 300 pieces in the pack, you'll have plenty for current projects and future repairs. The value is incredible - buying individual washers would cost way more. Toss them in your toolbox and you'll find yourself reaching for them more often than you'd expect!