All Dapra Ball Nose end mills accept either inch inserts or metric inserts of like sizes. For example: BNEM0750 and GWR20 accept either a 3/4" or 20mm diameter insert. BNEM0500 and GWR12 accept either a 1/2" or 12mm diameter insert.
Ball Nose end mill cutter bodies accept all insert styles: Ball Nose, Helical Ball Nose, Back Draft, Flat Bottom, High-Feed Back Draft and Rough-Duty Ball Nose.
**Start with these filters. They will guide you to the right cutter for your application.