Bearing Base Study ball turning Attachment for lathe-Radius -to 38 mm diameter. This fits straight onto the cross slide of your lathe machine for Quick Turning of Cones and Balls. Comes with a 1 Indexable TNMG16 Insert for best turning finish and results. Maximum Ball Diameter possible is 38 mm.The Head can be adjusted for different Ball Sizes. Listing and template services provided by inkFrog.