The Crush It Pro Clamps are crafted from 6061 aluminum, providing three mechanical benefits over the glass-filled nylon essentials. * The Pro clamps are more thermally resilient. The aluminum body of the Crush It Pro clamps can handle heat without deforming, making them ideal for projects that might generate for heat in the cut. * The Pro clamps can be tightened further, providing an increased holding force. This makes them perfect for more aggressive machining strategies. * The aluminum components ensure a longer lifespan than the Essential Crush It Clamps, while maintaining the same level of performance. This makes them ideal for high-volume production environments.