HSS for Making Knife(W18,W9,W6,W5,W2) 1.Used in making all kinds of ... knife, 2.Flat, bars,heat treatment High speed steel(W18,W9,W6,W5,W2)Planer knife1.Main applicationUsed widly in making ... grade: W18=T1 W6=M2 HSS for Making Knife(W18,W9,W6,W5,W2)