＊OD-tolerance: D≦3 -0.014 ～ -0.028, 3＜D≦6 -0.020 ～ -0.038, 6＜D≦10 -0.025 ～ -0.047, 10＜D -0.032 ～ -0.059 ＊Designd to mahine tool steel, alloy steel, mold steel and other high hardened materials. ＊4 flute allows for better workpiece finishes. ＊Increased production.