end mill holder 1.BT30 40 50 2.SK30 40 50 3.NT40 50 4.We supply the competitive price and good service end mill holder1.BT30 40 50 , SK30 40 50, NT40 502..It can be applied for heavy cutting and milling process generally .3.The cutting can be clamped precisely ,even it is worked in heavy cutting, it will not result in slipping on cutting tools. end mill holder