All Positive Rake Chamfer Hogs from AB Tools, Inc. use insert TPG 322 and Shim SM41. AB Tools, Inc. uses industry standard TPU (Utility) or TPG (Ground) -322 inserts, these indexable chamfer tools have positive axial rake. For use in most part materials, they come in a few popular angles. They also have modified shims under the inserts to protect the pockets. Very durable and free cutting. Proudly made in the USA by AB Tools, Inc.