BXA size Quick Change Tool Post. Includes a shop made T-Bolt to fit Clausing 5900 series lathes. 4 tool holders are Armstrong. I always thought this tool post was an Armstrong, but I see no brand on it. It looks identical to another Armstrong tool post I had, but without a tag I can't say it is. Unlike many others, tool holders can mount on 3 sides of this tool post. The tool holders are: 1, Armstrong tool holder 5A-QC that has been modified to use 1 inch tools. 1, Armstrong threading tool 5J-QC. 1 Armstrong boring bar holder 5G1-QC. 1 Armstrong Cutoff Blade holder 5D-QC, ...