The Manson Reamers 12 Gauge Choke Reamer comes with the threads TiCN coated. TiCN Coating, formally known as Titanium Carbo-Nitride coating, is an all-purpose strengthening coating that does especially well with cutting applications. Adding a total thickness of approximately .0001" - .0002" (2 - 5 Microns), TiCN coating will lengthen the life of your reamer and keep your tools sharper for longer. Screw-In Choke Tooling is only available as Removable (Live) Pilot Finishing Reamers. Pilot Bushings are not included. Additional Pilot Bushings can be purchased under Shotgun Pilot Bushings.