Cutter Hub 2 inch with a female 5/8-11 thread for holding star or saw tooth cutters made from high grade hardened steel. Saw tooth star cutter measures 1 1/4 inch with a 5/8 inch hole made from high grade hardened steel. For removing mastic and other heavy coatings. Comes with 60 preloaded cutters. Cutter hubs are used with 2 inch and 4 inch Air powered or Electric Rotopeens, Aargo Tool part # 904038 and # 904015 and # 904007 and # 904039 can be ordered separately.