These knives are over engineered to assure lifetime durability. The massive ¾ thick machined aircraft grade aluminum handle fits perfectly in your hand to provide the leverage for any heavy duty chore. The push button is recessed to prevent accidental opening, and the coil spring action deploys the massive 3" blade with authority. It's modular construction provies ease of maintainance. Weighting in at almost 5 ounces, the Thunder is among the heaviest knives in our line.