This is a KDK 0 Series Quick-Change Tool Post. Serial #: 0 10629. For lathes with 8″ to 12″ swing. Only a second to change tools. Rugged – No chatter or vibration. No time wasted with shims. Safe and simple to operate. Speed your lathe operations up to 90%. For fine precision work to heavy-duty cutting. Tool Post Overall Dimensions: 5″ x 3-1/2″ x 2-3/4 high. Comes exactly as shown in pictures.