Shrink Tubing Protects Electrical Connections 55-piece assortment of large size heat shrink tubing in 4 diameters from .393 inch dia. x 1-3/4 inches long through 1-3/8 inch dia. 2-3/8 inches long. Use for repairing electrical plugs, making batteries from a group of cells, bundling wires, covering DCC decoders, etc. Includes compartmented storage box.