Efficient "v"groove design securely holds round shank tools as well as square square bits 1/4" - 5/8". For use with BXA tool posts 250-200 or 250-222. Interchangeable with Dorian, Aloris, & Phase II BXA series mini tool posts. Completely sealed for maintenance free operation. Turning and facing tools can be locked together (saving time and labor when changing operations).10PCS BXA #1 Turning Facing & Boring Tool Post Holder 250-202. 10PCS BXA #2 250-202 Quick Change Tool Post Turning & Facing Holder For Lathe. If there is any fault or problem with the product, please don't be shy to express it, we will solve it at the first time.