THE BUCK MODEL AT123RC IS A 12-INCH OVERALL DIAMETER, 3 JAW, SELF-CENTERING MANUAL LATHE CHUCK. IT IS CONSTRUCTED FROM CAST IRON AND FEATURES A PLAIN BACK MOUNT SPINDLE. TECHNICAL SPECIFICATIONS INCLUDE A 4-INCH CENTER HOLE DIAMETER (OR 4-1/16 INCH THROUGH HOLE DIAMETER, DEPENDING ON THE SOURCE) AND A MAXIMUM ROTATIONAL SPEED OF 1,500 RPM. THIS CHUCK IS ADJUSTABLE AND REVERSIBLE, OFFERING A TIR REPEATABILITY OF 0.0254.