Wire Markers and Cable Labels for Easy Wire ID No matter what your situation, wire markers help you to easily distinguish which cable belongs to what device. Not only that, but you can even add small notes for other people who may be handling the wires. No matter what, it is a simple step to take and one that will make your life a hundred times less complex! Wire Markers Prevent Mix-Ups Wire Markers and Marking Labels - grainger A wire marker from Grainger can help your business with its cable management by labeling wires that run to servers, electrical installations and switch panels, reducing the time it takes to troubleshoot and reinstall components. Find a cable marker book for coaxial cables or a roll of numbered wire marker tape for a dispenser tool.