Lathe Tailstock Die Holder Set Of 4 Floating Type MT3 SHANK Holds Metric Die. With Wooden Case. Shank Size MT3 Die Holder Sizes 20.6 MM 25 MM  30 MM 38 MM Ideal for cutting accurately aligned threads on lathe machine using standard dies. Holders are held on shank by a pin which fits in slot on either side of the holder allowing about 1-1/2" of Smooth travel. Set includes a punch of size 3/8" for easy removal of split button die.