Abstract: Belt piece, of the type which can be closed as a loop and usable for the transport of articles and/or for power transmissions, which comprises a central body (80) and two restrainable ends (2), (3), which: extend in parallel to the longitudinal axis of the belt piece (1); have transverse dimensions smaller than the ones of the central body (80); and at longitudinal sides (81), (82) have complementary coupling profiles (4), (5) comprising a plurality of first (6) and second portions (7). These portions are arranged in mutual contact when the ends (2), (3) are coupled and press the one against the other in case a longitudinal traction effort is applied to the belt piece (1), closed as a loop, to prevent the ends (2, 3) from sliding in longitudinal direction.