Mechanical Hydraulic spindle without original clutch mechanism.Rigid material-vise body of ductile iron FCD60JIS ( Equal toGGG60 ) with 60kgs/mm2or 80,000PSi tensile strength.Down thrust “semi-sphere segment” mechanism eliminates jaw lift and work tilt.Vise bed flame hardened to HRC45° and up takes up wear and maintain accuracy for long.