Ball Turning Attachment For Lathe-Turns Round Concave and Convex Metal-Sphere Fits directly on the Cross Slide direct of your Myford Lathe. However Can fit to Larger Machines by using Packing to Adjust Center Height Can turn up-to a 42 mm diameter Metal or Wood Ball. Can be Adjusted for Various Sizes of Balls. Supplied with 2 Pcs x 3 Sided Indexable TNMG16 Tips Design For Internal & External Turning Bearing Base Smooth Rotation.