The Wheeler Interchangeable Hammer Set includes 2 hammer bodies and 8 hammer faces, 4 hammer faces with each hammer body: metal, brass, nylon and rubber. Hammer bodies are made of precision machined metal. The large hammer is ideal for driving out large or stubborn roll pins while the small hammer is designed for precise control of smaller roll pins. The steel head is for metal punches and surfaces, the brass head is for preventing marring of metal surfaces and for brass punches, the plastic head is non marring, and the rubber head is low recoil, and can prevent denting of wood. The entire set comes with a durable molded case that organizes, holds and protects all the components in one place.