T23599 Super Quick Change Tool Post 5 Piece Set Up to 12. The triple action wedge-locking system from Dorian provides a powerful combination of a downward, outward and inward force that simultaneously locks the holder. Maximizing rigidity further is the tool post body made from chromium-molybdeum alloy steel, which is thru-hardened, surface-treated, and xylan-coated for for protection and durability in machining environments. Precisely machined and ground with the most advanced technology. Super precision tool holder locking. Thousands of pounds of locking force with a ...