JEGS Bore Brush Set includes steel, brass, and nylon brushes. The twisted wire bore brushes are durable and abrasive; marvelous for cleaning tubes, ports, bearings, and other general wire brush applications. Each brush has a 1/4” hex drive for use with the included 2-piece quick release screwdriver handle. The set comes in a molded plastic case to help you keep all of your brushes together and organized.