S, R, Q, P (Т2, Т1, СТ3, СТ2)
Cutting off, slotting, hand snagging operations, circular external grinding, centreless grinding, uneven surface and profile grinding.
N, M, L, K (С2; С1; СМ2; СМ1)
Fine and combined circular, external centreless and internal grinding of steel, flat surface grinding, thread grinding, cutting tools sharpening.