New, not used, drill bit, pin, d. 76 mm, thread R32, 14 spherical pins, frontal 6 x Ø10 mm, peripheral8 x Ø12 mm. Angle of inclination of peripheral pins 35?.
There are 2 flushing holes. Length of the crown - 136 mm. Weight 2.75 kg.
Confirmed durability of the crown when drilling rocks represented by siliceous aleuropellites, hardness factor f = 15 on the scale of Prof. Protodyakonov slabbed, stable, - not less than 157.33 spurometers. Stability is confirmed by the Act (Protocol) of tests at the mines of mining enterprises, approved by the first head.
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