Abstract: The object of the present invention is a clamping device which comprises a first element and a second element which are arranged symmetrically, rotatably engaged and mutually constrained, and engagement means which are constrained firmly to the first element and envisaged to engage with the second element. The device is designed to operate from a resting position, in which the first element is in contact with the second element, and from a working position, in which the first element and the second element perform a clamping and constraining action on an object. In particular, both the first element and the second element are substantially made up, respectively, of a curvilinear part, designed to come into contact with the objects to be constrained, a straight central part and a flat end part. Furthermore, the engagement means comprise a spring engaged with a U-bolt and a chain which has a plurality of rings, each one of which being designed to hook onto the hooking means.