Drill rods are round with a diameter from 22 to 42mm, hexagonal in sizes from 19mm to 35mm, length from 500mm to 6000mm. The rods are manufactured with a cone, round ("rope"), trapezoidal, metric thread from hexagonal or round rolled products with a central hole made of steels of grades 18ХГН3МА, 28ХГН3МА, 40ХГСМА, 55С2 with volume hardening or case hardening of the entire surface and hardening of the impact end.