The product is a set of 50 ~ 4-6 steel brake rivets with a black finish, specifically designed for car and truck brake systems. The rivets have a 9/64" stem diameter, 3/8" length, and 5/16" head diameter, making them suitable for various brake applications. Produced by Grizzly Brake, these high-quality rivets ensure durability and reliability in braking systems, providing a sleek and efficient solution for maintaining and upgrading vehicle brakes.