The invention relates to a retractile finger (1) for fitting to a grain harvester auger (3) main shaft (2), which retractile finger comprises an elongated portion (4) having at one of its ends a portion in the form of a guide (5) for fitting to the above-mentioned shaft (2), the elongated portion (4) and the portion in the form of a guide (5) being formed in one piece made of polyethylene with a molar mass of between 3.9 and 10.5 million g/mol.
