extruded aluminum,so it's both stronger and lighter than cast iron clamps Mega-Clamps are available in Black Anodized, Polished Aluminum, ... , extruded aluminum, so it’s both stronger and lighter than cast iron clamps. The Mega-Clamp’s safety factor far exceeds industry ... is half the weight, and twice as strong as most cast iron clamps.The Mega-clamp, in 1993, introduced to the industry ...