HSS drill bit-tip angle is generally 118 degrees, sometimes greater than 130 degrees; the blade is sharp; the accuracy (blade height difference, symmetry, circumferential runout) is relatively low. There are many ways to repair chisel.

HM drills-the top angle is generally 140 degrees; straight flute drills are often 130 degrees, and three-edged drills are generally 150 degrees. The blade and the tip (on the edge) are not sharp and are often dulled, or called inverted edges and chamfers; high precision is required. Chisel blades are often repaired into an S-shape to facilitate chip breaking.

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