The Performance Tool Recessed Star Brake Caliper Sockets set includes three sockets in sizes T-40, T-45, and T-50. These specialty sockets are designed for torx drive types and feature a black chrome surface finish for durability. The sockets are suitable for use with a 3/8in drive size and are ideal for automotive applications, particularly for working on brake calipers. This set is a single item purchase from Performance Tool, known for its quality hand tools in the automotive industry.