The name heat-shrink tubing pretty much sums up what it is and does: a plastic tube that shrinks permanently when heat is applied. How much it shrinks is determined by its shrink ratio, commonly ranging from 2:1 to 6:1. Think of heat-shrink tubing as the duct tape for electrical wiring on the factory floor. Heat-shrink tubing is versatile, easy to use, and finds wide applicability in maintenance and repair.
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