Shars DA Quick Change Tool Post Holder #4 Heavy Duty Boring Bar 250-504 CNC New. Interchangeable with Dorian Aloris & Phase II Series. QUICK CHANGE TOOL POST CATEGORY. QUICK CHANGE TOOL POST SERIES. Made of high quality Alloy tool steel 40Gr which is forged and has longer life. High quality 10.9 grade screws which have 1 time longer life than others. Center bolt thread : M14x1.5. Height adjustment screw allows to accommodate various center height of different lathe chuck. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & ...