Commonly used tungsten carbide blades shapes has equilateral triangle, parallelogram, pentagonal, convex triangular-shaped, circular, diamond and so on.When the basic parameters of blades by the inner circle diameter of the blade-shaped profile determined, the series of size (mm) is 5.56,6.35,9.52,12.70,15.88,19.05,25.4 ... Various of blades shapes with or without a central hole hole; there without chipbreaker, there are one or both sides have chipbreakers; there with no angles or with different post-post corner. Common blade tolerance levels have three kinds, for precision respectively (G), the grade (M) and the general level (U), the user can choose according to different needs.