Countersink cutters 90°-60° type S group 0 in HSS hardness 63 HRC, from Ø 8,3 to Ø 16,5. You can fit them in all the Polledri holders of the same group. These cutters with 3 flutes are manufactured to solve in rational way all the problems of countersinking. Their main characteristic,as well as the possibility to execute simultaneous operations with pilots or drill, is high performance without vibration.