Shars 14-20 CNC Lathe CA Piston Quick Change Tool Post Set 250-400 New. Interchangeable with Dorian & Phase II Series. QUICK CHANGE TOOL POST CATEGORY. Quick Change Tool Post Sets. QUICK CHANGE TOOL POST SERIES. QUICK CHANGE TOOL POST TYPE. The locking mechanism of piston tool post is to push the holder out against the angle gib ways of dovetail by the center hole piston. Precision ground and hardened on the piston contact surface and the dovetail to ensure rigidity and repetitive accuracy. Advanced design provides positive rigidity to minimize chatter and vibration in turning. Can be quickly and easily installed on an engine, bench or turret lathe for a wide range of operations, from precise work to heavy duty cutting. Please double check your dovetail dimensions. 1 Indexable Carbide Turning Tool Set. 1/8 x 7/8″ P5X “P Type HSS Cut-off Blade. 3/4 RH SCLC Small Screw Lock Positive Insert Tool Holder. If you need to speak to a sales person feel free to call. We are open Monday through friday 8:30 to 5:00 est.