Small High Quality 8OZ Dual-Head Non-Sparking Brass & Nylon Gunsmithing Hammer This small gunsmith brass hammer is special designed for its anti-sparking qualities. Nylon head resists breaking, wont mar metal. Solid brass is the Basic for gunsmith use with punches and more. Small Sized Hammer: Length: 7.36 inches or 18.7 CM. Head Diameter: 0.75 inches or 1.9 CM. Head Length: 2.05 inches or 5.2 CM.