One tip is designed in the shape of the pre-2010 groove dimension and the other is designed in the shape of the post 2010 groove dimension, as defined by the USGA rules of golf. The purpose of the tool is to "clean up" and enhance the existing groove on an iron. You can not use one to change the shape of a pre - 2010 into a post 2010 groove, or visa versa. Also, there are no guarantees of conformity after use. That can only be determined by precise measurements using the accepted tools and methods of the USGA.
Date published: 2017-04-27