Fits directly on the Cross Slide direct of your Myford lathe machine to match its center height of 52mm, Can be used for even larger machine using packing to adjust the center height of the cutting tip Comes fitted with bearing base for smooth rotation to achieve a great finish in epoxy black finish for a rust free life. Can turn up-to a 50 mm diameter Metal or Wood Ball. Can be Adjusted for other sizes of balls too. Supplied with 2 Pcs x 3 Sided Indexable TNMG16 carbide tips Can turn concave and convex balls, the diameter of which could be adjusted through the sliding cutting tip holder