Complete OXA-size wedge-type quick change tool post set for mini and hobby lathes. Fits any OXA-compatible holders (Phase II 250-0xx, Aloris OXA, and the various import equivalents). Wedge-type design - more rigid than piston-style posts. Holders mount on the dovetails and lock with wedge action when the handle is turned. Stud is M10 (standard for OXA). 250-000 - Wedge-type tool post body with stud, lock nut, washer, and tommy bar handle. 250-001 - Turning & Facing Holder, takes tool bits up to 1/2". 250-002 - Boring, Turning & Facing Holder, takes tool bits up to 1/2". 250-004 - Heavy-Duty Boring Bar Holder, accepts 3/8" and 1/2" boring bars. 250-007 - Cut-Off / Parting Blade Holder, accepts 1/2 tall parting blades. 250-010 - Knurler with both knurl wheels installed Condition: Excellent throughout. I don't think it was ever used. No rust, no pitting, no damage. Black oxide finish is clean on every piece.