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The invention relates to the clamps. A clamp contains a housing with stationary jaw, a set screw with support installed in the housing, a supporting element and a flat roller with V-shaped annular groove installed on the supporting element with possibility of rotation. The housing is made from two parts, on one of which the stationary jaw is secured, and on another one - set screw, the parts of the housing are connected by means of coupling screw with nut with possibility of rotation around the axis of this screw.