Durable Quality Nylon Cable Ties
http://goo.gl/2S4XBg <br />The common tie-wrap, normally made of nylon, has a 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 tie-wrap tightens and does not come undone. Another version of the tie-wrap allows a tab to be depressed to either adjust the tension or remove the ty-wrap.