The Wheeler Engineering Master Gunsmithing Interchangeable Hammer Set is quality crafted to meet the needs of professional gunsmiths and at home do-it-yourselfers. The hammer bodies are made from precision machined metal for durability. The large hammer drives out large stubborn roll pins while the small hammer is used for precise control of smaller pins. The interchangeable hammer heads are used for metal punches and surfaces, preventing marring, and controlling recoil to prevent denting. It's all packaged in a convenient case to keep your tools organized for your next project.