A crimping device comprising: a first jaw having, across its width and extending at least partially along its length first, second and third crimp members (16a, 16b, 16c) with a depression (20a, 20b) between the first and second crimp members (16a, 16b) and between the second and third crimp members (16b, 16c) and the crimp members (16a, 16b, 16c) running lengthwise each configured to provide a deformation (50a, 50b, 50c) on one surface of a crimp tube; a second jaw having, across its width and extending at least partially along its length, first and second crimp members (18a, 18b) with a depression between the first and second crimp members (18a, 18b) and the crimp members (18a, 18b) running lengthwise each configured to provide a deformation (52a', 52b') on an opposite surface of the crimp tube thereby creating a crimp pattern in crimp tube when the first and second jaws (14a, 14b) are brought together about the crimp tube; the first crimp member of the second jaw opposing one depression of the first jaw, the second crimp member of the second jaw opposing another depression of the first jaw, and the second crimp member of the first jaw opposing said depression of the second jaw; a first handle for the first jaw: a second handle for the second jaw; and each jaw having a stop member (26a, 26b) located proximal of the crimp members of the jaw defining a predefined gap between the second crimp member of the first jaw and the corresponding depression of the second jaw and between the first and second crimp members (18a, 18b) of the second jaw and the corresponding depressions (20a, 20b) of the first jaw when the jaws are fully closed; characterised in that at least the second crimp member of the first jaw and the first and second crimp members (18a, 18b) of the second jaw are protrusions with a rounded profile in a cross-section which is transverse to the lengthwise direction. a first jaw having, across its width and extending at least partially along its length first, second and third crimp members (16a, 16b, 16c) with a depression (20a, 20b) between the first and second crimp members (16a, 16b) and between the second and third crimp members (16b, 16c) and the crimp members (16a, 16b, 16c) running lengthwise each configured to provide a deformation (50a, 50b, 50c) on one surface of a crimp tube; a second jaw having, across its width and extending at least partially along its length, first and second crimp members (18a, 18b) with a depression between the first and second crimp members (18a, 18b) and the crimp members (18a, 18b) running lengthwise each configured to provide a deformation (52a', 52b') on an opposite surface of the crimp tube thereby creating a crimp pattern in crimp tube when the first and second jaws (14a, 14b) are brought together about the crimp tube; the first crimp member of the second jaw opposing one depression of the first jaw, the second crimp member of the second jaw opposing another depression of the first jaw, and the second crimp member of the first jaw opposing said depression of the second jaw; a first handle for the first jaw: a second handle for the second jaw; and each jaw having a stop member (26a, 26b) located proximal of the crimp members of the jaw defining a predefined gap between the second crimp member of the first jaw and the corresponding depression of the second jaw and between the first and second crimp members (18a, 18b) of the second jaw and the corresponding depressions (20a, 20b) of the first jaw when the jaws are fully closed; characterised in that at least the second crimp member of the first jaw and the first and second crimp members (18a, 18b) of the second jaw are protrusions with a rounded profile in a cross-section which is transverse to the lengthwise direction. a second handle for the second jaw; and each jaw having a stop member (26a, 26b) located proximal of the crimp members of the jaw defining a predefined gap between the second crimp member of the first jaw and the corresponding depression of the second jaw and between the first and second crimp members (18a, 18b) of the second jaw and the corresponding depressions (20a, 20b) of the first jaw when the jaws are fully closed; characterised in that at least the second crimp member of the first jaw and the first and second crimp members (18a, 18b) of the second jaw are protrusions with a rounded profile in a cross-section which is transverse to the lengthwise direction.