1CNC carbide end mill cutter 2HRC:65 3blade length can be done on your desicion 4impact resistance ... , impact toughness is poor, not the very sharp blade grinding. d), • 4-flute design with 30° helix produces a good surface ... , No.222, Jiyang Middle Road, Yangshe Town, Zhangjiagang,Jiangsu,China 65 HRC CNC carbide end mill cutter