Dorian SD50DA Super Quick Change Tool Post - DA50 Size - Wedge Style - Made in USA. Up for sale is a genuine Dorian SD50DA Super Quick Change Tool Post in the desirable DA50 size. This is the heavy-duty wedge style system (NOT piston type) designed for 17"-26" swing engine lathes and built for industrial rigidity and repeatability. Wedge Locking Design (Superior to piston style)? Accepts Dorian D50DA Tool Holders? Large Cam Lever with Red Ball Handle? Condition: Good used condition with normal cosmetic shop wear. No cracks, no repairs observed. Ready to install and run. Cam lever ...