These rivets are high-quality, high-strength, American-made rivets that meet tough IFI standards. They can be used in either blind-side applications or where both sides of the work are accessible. They're vibration-resistant, tamper-resistant and provide secure fastening of thin and thick applications and hard and soft materials. Both the rivets and mandrels are aluminum. Sold in packages of 250. Dimensions shown are Hole x Max Grip Length.