The 5 Inch PVC Cable Ties, normally made of nylon, has a flexible tape section with teeth that engage with a pawl in the head to form a ratchet so that as the free end of the tape section is pulled the cable tie tightens and does not come undone. Some cable tie clips include a tab that can be depressed to release the ratchet so that the tie can be loosened or removed, and possibly reused.
The most common zip-tie consists of a flexible nylon tape with an integrated gear rack, and on one end a ratchet within a small open case. Once the pointed tip of the nylon cable tie has been pulled through the case and past the ratchet, it is prevented from being pulled back; the resulting loop may only be pulled tighter. These wire zip ties allow several cables to be bound together into a cable bundle and/or to form a cable tree.
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