ALORIS CA 8 THREADING HOLDER INTERCHANGEABLE BLADE CNC LATHE QUICK CHANGE USA. Our part # ALO-CA-8. This universal threading holder comes with an interchangeable high speed threading blade which has two cutting edges. You may now reverse your spindle and cut a thread without fear of hitting shoulders. Increase your threading capabilities! Holders supplied with CA-P4 blade. Slash Your Setup Time- instant changing from one operation to another! We also sell custom tooling packages!