2 sided KDK Quick change attachments for metal lathe. You can have a cutter on each side and flip it… For faster, quick change…. Save space and time. Please use the pictures for reference. If you have any questions please feel free to reach out. With no reserve on any of my listings. If you like what you see I have a lot of other items related. Lots of high quality machinery tools. These tools came from a high precision arrow space company that would manufacture for the u s military based in california. 600 wide slot so it takes a 1/2” bit so is most likely KDK 106. Please use the pictures as reference.