New, not used, the crown pin, nominal diameter 130 mm, the shape of the head part - with a core notch, the connection of the crown - bayonet, the form of hard alloy-ballistic, the angle of inclination of the peripheral row of pins - 40 degrees, the peripheral row - 8 pins na14 mm, frontal row - 7 pins na14 mm, the number of blowing holes -1, length 188 mm, weight 6.5 kg. The durability of the crown is not less than 50 metres when drilling in rocks and ores with a coefficient of hardness f = 14...16 on the scale of Prof. Protodyakonov.
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