For sale is a NEW, Lathe Carbide Insert Tool Holder MSKN R16-4D Made in USA. Dimensions of Shank (approx.): 4.75" x 1" x 1" Insert Shape: Diamond I believe this is new because I do not see marks on the top of the holder where there would normally be if it had been placed in a machine and clamped down. However, I am not 100% sure about it.