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When ordering heat shrink tubing, you should know both the expanded and recovered dimensions.
The expanded dimension is what the tubing measures when it is in its expanded state. The recovered dimension is what the tubing measures when it is heated and recovered on the rod.
Wondering what you should do if you do not have these dimensions? Measure the object you want to use heat shrink on for its outside diameter. Also, know if you want the heat shrink supplied in coils or straight lengths.