Allstar Black 1/4 inch to 3/8 inch Grip Range Small Head Rivet with Aluminum Mandrel (Pack of 250) feature head rivets that have an aluminum mandrel and black finish on the rivet head. The rivets have a 1/4 inches to 3/8 inches range. It is sold as one set of 250 pieces. It is perfect for use around the shop or race track. There are several other popular sizes and colors which are also available and are sold separately..