Drill bit (10) includes interface (12), and there are two mouthpiece (20) for tool. The end (20a, 20b) of each mouthpiece component faces another interface component, and it includes one or more pivots (26) and stop system that both ends, which are connected with each other through engagement device,. The mouthpiece component of halt system limit relative angular displacement is from base position towards horse. In base position, the both ends of the attachment device are located substantially at by the arrangement along straight line with mouthpiece component to be arranged. Stop system prevents the mouthpiece component of relative angular displacement from base position towards horsing or limit relative angular displacement, and in this direction, the mouthpiece component of the relative angular displacement of at least partially maximum possible is from base position towards horse.
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