extruded aluminum,so it's both stronger and lighter than cast iron clamps Mega-Clamps are available in Black Anodized, Polished Aluminum, and Powder Coated White. The Mega-Clamp is created from high tensile, aircraft grade, extruded aluminum, so it’s both stronger and lighter than cast iron clamps. The Mega-Clamp’s safety factor far exceeds industry standards, breaking at over 2-1/2 tons at an ...