New, not used, pin, nominal diameter 110mm, the shape of the head part - with a core notch, the connection of the crown with the pneumatic striker - spline, the shape of the carbide - a hemisphere of increased wear resistance, the form of shank slits, the angle of inclination of the peripheral row of pins - 40 degrees, peripheral row - 8 pins at 14mm, frontal row - 7 pins at 12mm, the number of blow holes 2, length 179mm, weight 4.4kg. Confirmed durability in drilling conditions of rocks represented by microquartzites with coefficient of strength f=14-16 according to Prof.
Protodyakonov's scale, category of drillability not less than XVII - not less than 110 metres.
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