Hey DIYers and mechanics! This Swpeet rivet kit is exactly what you need for all those repair and building projects. You get 410 pieces total with multiple sizes: 80 of the 1/8\ x 1/4\, 60 each of the 1/8\ x 5/16\, 1/8\ x 3/8\, and 1/8\ x 1/2\, plus 50 each of the 3/16\ x 5/16\, 3/16\ x 3/8\, and 3/16\ x 1/2\. The rivets themselves are aluminum with steel mandrels - which is exactly how they're supposed to be! The steel center is what actually deforms the softer aluminum to create that secure hold. These small flange rivets work great for both indoor and outdoor use since aluminum doesn't rust. They've got good temperature resistance and won't deform your surfaces during installation. I used these on my boat for attaching trolling motor plugs and downrigger sockets - way better than screws that tend to work loose over time. The quality is solid, especially for the price compared to buying individual sizes separately. Whether you're working on metal crafts, car modifications, or general repairs around the house, having this variety pack means you'll always have the right size on hand. Just make sure to check the grip range before you buy to get the proper size for your project. Seriously, if you do any metalworking or frequent repairs, this kit will save you multiple trips to the hardware store!