Description: Securely holds 1/4 – 5/8 square diameter tool bits. Interchangeable with Dorian, Aloris, & Phase II BXA series tool posts. For use with BXA tool posts 250-200 or 250-222. Precision ground and hardened. Completely sealed for maintenance free operation. Turning and facing tools can be locked together (saving time and labor when changing operations). The Product Has Passed Strict Quality Testing. Durable And Easy To Install And Replace. Cost-effective, Good After-sales Service. Quality Assurance For Your Peace Of Mind.