Extension for pins with wear leads, formed from a thin-walled hollow profile (1) with an appropriate length, the inner cross-section of which is adapted to the shape of the common pin cross-sections, on the side of the extension on which the sharpened end of the pin is located, one or more slots ( 2) having an appropriate length in the longitudinal direction in the lateral surface and a slight, linear reduction (3) in the cross section approximately over the length of the slot or slots in the direction of the end, with longitudinal elevations (4) in the form of triangular, square and / or semicircular prisms, which are realized in an appropriate number, arrangement and length depending on the pin cross-section and directed inwards, the height of the elevations (4), which can grow slightly in the direction of insertion of the pin, is selected so that it pushes the pin in notch slightly and the height of these bumps (4) on the side of the extension on which the Pin is inserted, is linearly reduced to zero over an appropriate length (4a) and in the inner surface of the extension (1) in an appropriate number and arrangement inwardly bent or protruding retaining springs (5) are arranged, which on the side to the upper extension end are connected to the rest of the lateral surface and separated from this in the remaining area.
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