DRY-SHRINK Thin Wall Heat Shrink, 0.187 Inch (4.8 mm) Diameter, 0.093 Inch (2.4 mm) Maximum Recovered Inside Diameter, 48 Inch Lengths, 25 pieces, Black. For use in insulating, protecting, harnessing and identifying electrical and electronic components. Shrink Ratio is 2 to 1. Temperature Range is -67 degrees Fahrenheit to 275 degrees Fahrenheit (-55 degrees Celsius to 135 degrees Celsius). Voltage is 600 Volts. UL Recognized. CSA Certified. Military Specification AMS-DTL-23053/5 Class 1 (material performance only).