4 Independent Jaw Chucks have a semi- steel body made of high tensile cast iron with hardness ranging between 180 and 220 BHN. These Chucks are fitted with alloy-steel jaws that are made of forged steel as well as jaws that are made of steel with tensile strength of above 500 MPA. These 4 Independent Jaw Chucks are robust in construction and accurate in dimension. 4 Independent Jaw Chucks come in different specifications to suit specific requirement.