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Zip Tie
From WikiPedalia
A plastic fastener primarily intended for bundling electrical wiring together, but also very useful for securing cables and other items to bicycles. A zip tie consists of a toothed plastic strip with a one-way ratcheting hole at one end. You slide the plain (usually pointed) end of the ziptie into the hole and can pull it tight, but it will not loosen up.
4th hand tools are particularly useful for securing zip ties.
For bicycle applications, avoid using white/clear zip ties, because they are liable to deteriorate due to exposure to ultraviolet radiation when used outdoors.
