Allstar Black 1/16 inch to 3/8 inch Range Multi-Grip Style Medium Head Rivet with Steel Mandrel (Pack of 250) has a steel mandrel and silver finish on the rivet head. The rivets are multi-grip style and have a 1/16 inches to 3/8 inches range. They are sold as one set of 250 pieces and are 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..