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HARTWANA BT40 Shrink Fit Shrinker End Mill Holder With Metal Ceramic Milling Cutter BT40-SF04-80 G2.5 25000rpm About metal ceramic milling cutter Professional milling cutters, metal ceramic end mills Available materials. 45#, P20, 20Cr, 40Cr, NAK80, 718H, S136, 2738, B30, H13. Its characteristics are 1、Good wear resistance, can reach 3-5 times of carbide life. 2、Good finish, can reach the mirror effect of processed parts. 3、Good versatility, wide range of use, soft and hard, widely used 4、No need for coating, easy to use when regrinding repeatedly. Items include BT40-SF04-80 1PCS D4mmX50mmX10mmX4F