This is a KDK 300 Series Quick-Change Tool Post Holder. For lathes with 24 swing & up. 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. KDK-302: Threading & Facing Bar Combination – 1-1/4 Capacity. Comes exactly as shown in pictures.