When building racks these are really useful for colour-coding the same type of connector that does different things - we recently had both 1Gb and 10Gb ethernet connections and used green for one and yellow for another.
Combined with coloured rings/boots on the CAT5e/6a connectors, anyone can plug up a rack without needing to understand everything.
Only downside (hence -1 star) is that they're a bit squishy, so even when the connector is fully tightened into the rack it can wiggle a bit.
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