The quick change tool post is a main accessory of the machine tool, it is consist of tool post and many kinds of tool holders, according to the processing requirements of the workpieces, correspording tool holders are selected to finish cylindrical facing, end facing, cutting, drilling, reaming, boring as well as other processing. It is satisfactory accessories in place of square turrets Includes Tool Post and Tool Holders: No. 1 Turning & Facing Holder with 3/16-1/2 Tool Capacity No. 2 Boring, Turning & Facing Tool Holder with 3/16-1/2 Tool Capacity No. 4 Boring Bar Tool Holder with 5/8 & 3/4 capacity No. 7 Universal Parting Blade Tool Holder with 1/2 blade height No. 10 Knurling, Facing & Turning Tool Holder 3/16-1/2″ Increases production of lathe operations Change tools quickly and easily -No time wasted with shims SUPER ACCURACY-PISTON TYPE FOR POSITIVE CLAMPING-INTERCHANGEABLE WITH Aloris, Doricn and Phase II Piston type tool posts are precision engineered to assure repetitive accuracy Advanced design provides built in quick tool changing versatility with positive rigidity to meet the most exacting working tolerances Quickly and easily installed on an engine, bench or turret lathe for a wide range of operations, from fine precise work to heavy duty cutting 6pc AXA QUICK CHANGE TOOL POST FOR LATHE WITH 6″ TO 12″ SWING PISTON TYPE 250-100 SERIES, the thread size of the stud that runs through the center of the tool post: M141.5 Suitable for lathe center height 0.6 – 1.75″ (top compound surface to lathe center line), such as: South Bend 9″ & 10″, Atlas 10 & 12″, Delta 10 & 11″ Nardini TT1000 & TT1200 and many other import lathes Interchangeable With Aloris, Dorian & Phase II All working parts hardened and precision ground.