Center Height is 52 - 52.5 mm which is pre-designed and prefixed for Myford Lathe Machines. Can fit to Larger Machines by using Packing to Adjust Center Height * Can turn up-to a 50 mm diameter Metal or Wood Ball. Can be Adjusted for Various Sizes of Balls.* 2 Pcs x 3 Sided Indexable TNMG16 Tips Design For Internal & External Turning *Free Shipping All Over the World. Delivery within 1 Week Maximum.