Clamp

A clamp comprising:

• a first arcuate portion;
• a second arcuate portion;
• a hinge having a shaft about which one of the first arcuate portion and the second arcuate rotates;
• and
• a ratchet mechanism for locking the first and second arcuate portions in a closed position;
• wherein the ratchet mechanism comprises a linear rack provided with the second arcuate portion and a pawl provided with the first arcuate portion for receiving the linear rack;
• wherein the linear rack includes a first set of teeth on a first surface and a second set of teeth on a second surface, the second surface opposite of the first surface, the first set of teeth different than the second set of teeth and the pawl comprises a finger which is configured to engage at least one of the first set of teeth and the second set of teeth of the linear rack;
• wherein the pawl is formed by a module which is detachably connected to the first arcuate portion, wherein the module is one selected from a plurality of interchangeable modules, each finger of the plurality of interchangeable modules is configured differently from the other so as to engage the linear rack in different manner.