According to the invention, a tool for assembling and disassembling an elastic collar includes first and second jaws mobile relative to each other. The first and second jaws respectively include first gripping profiles, the first gripping profiles being adapted to interact with the elastic collar and being provided opposite each other along a first predetermined and general collar-gripping orientation relative to the jaws. The first and second jaws respectively include at least second gripping profiles, the second gripping profiles being provided opposite each other and being adapted to interact with the elastic collar along a second predetermined general gripping orientation relative to the jaws, the second orientation being different from the first orientation.