FIELD: cone bits for well drilling. SUBSTANCE: relation of length of working surface in cone bit of auxiliary periphery cutting structure to bit diameter is determined as l/D≥ 0,127, with 1/D varying from 0.127-0.5, where 1 is length of working surface of periphery cutting structure, and D is bit diameter. Relation of width of step formed by leading and periphery cutting structure to bit diameter is determined by a/D≥ 0,127+0,9[b], where a is width of step, and b is step height. EFFECT: higher efficiency. 2 cl, 6 dwg
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