GATASCREWS Aluminum Pop Rivets are made from high quality aluminum for long lasting durability and dependability. They are designed for fast installation and removal. These aluminum blind rivets are great for thin (4 mil) to medium thickness (8 mil) materials. These aluminum pop rivets are perfect for indoor and outdoor use. These aluminum rivets are a great alternative to traditional stainless steel pop rivets. Each aluminum rivet is packaged in a resealable bag to help keep them clean and organized. Please note that the head of these pop rivets is domed, not flat.