This is a KDK 0 Series Quick-Change Tool Post. 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: 3-3/8″ x 4-3/4″ x 2-3/8 high. Comes exactly as shown in pictures.