Not sure if it's wedge or piston operated... Will fit a lathes swing. Aloris site says lathes CXA 13" to 18" with 3" block height and 3" block width 3. Armstrong QC-5 Quick Change Tool Post, block height and 3" block width 3". Armstrong Heavy duty boring bar holder #5G1 QC, inside diameter... Armstrong Cut off tool holder #5D QC, has grind marks..... No Name Bit holder - has grind marks.. T - slot is 21/4" x 3/4" x 1/2" x 3/8" see pic. The item "Armstrong QC-5 QUICK CHANGE TOOL POST With3 Holders CXA Series" is in sale since Tuesday, June 8, 2021. This item is in the category ...