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DRYSHRINK Thin Wall Heat Shrink, 2 Pieces Each .6 inch .5 inch (1.5 mm 12.7 mm), 6 inch (152.4 mm) Lengths, Black crosslinked Polyolefin Heat Shrink. Small package fits easily in tool box, Shrink ratio of 2 to 1 insulates a wide range of diameters and irregular shapes. Crosslinked, ultraviolet resistant material improves flame retardancy, chemical, and temperature resistance. Voltage is 6 Volts. UL Recognized. CSA Certified. Military Specification is AMSDTL2353/5 Class 1 (material performance only).