"STANLEY" ENGINEER HAMMERPatented tuning fork design reduces harmful vibration that can cause wrist and arm injuries Forged, one piece steel construction for increased strength and durability Rim temper reduces incidences of chipping or spalling Ergonomically designed handle with rubber grip for increased comfort and performance Great for striking wood, concrete, metal or stone.Fatmax 3 LB Anti-Vibe Engineering Hammer Made For Striking Wood,Metal Concrete Or Stone Ergonomic Grip For Comfort & Control Patented Tuning Fork Handle For Reduced Vibrations When Striking Longer Handle Provides A Greater Arc Swing To Generate Increased Power Per Strike.