50"/1250mm X-large - 4 JAWS CHUCK , independent jaws. ADJUST INDEPENDENTLY TO CENTER. PRECISION SEMI-STEEL BODIES. TOP QUALITY. AMERICAN STANDARD. 4 INDEPENDENT REVERSIBLE HARDENED JAWS. STRAIGHT RECESS OR PLAIN BACK SPINDLE MOUNTING. Internal jaws clamping range: 145-930mm External(reversed) jaws clamping range: 295-1250mm 385mm/15-1/2" THRU HOLE DIAMETER Body thickness: 185m 8 mounting thread holes distributed circle diameter: 500mm 8 mounting hole diameter: 22mm Recess diameter: 400mm Weight: 800 lbs