Crimps are designed to hold one or more cords together without joining them and are made using different materials for different uses; plastic for wires, metal for industrial use and valuable metals for jewelry and clothing. In pottery they are to hold bracelets, necklaces and belts and are attached to the ends that have to be joined to another piece like a hook, claw or buckle. The drawing shows three that are designed to use in different ways.
a) The crimp has two sections so the cord can be slipped through both, leaving a semi-circle
b) The second does not open so what it is attached to must open, like a hook.
c) A hook.