3M Heavy-Duty Polyolefin Heat Shrink Tube HDT 4500 Black 48-in piecesGeneral Information Brand 3M Splice Type Heat Shrink Country Of Origin United States Sold As Case California Residents Proposition 65 Warning Dimensions and Specifications Inner Diameter After Shrink (Imperial) 1. 5 in Inner Diameter After Shrink (Metric) 38. 1 mm Inner Diameter Before Shrink (Imperial) 4. 5 in Inner Diameter Before Shrink (Metric) 114. 3 mm Maximum Operating Temperature (Celsius) 110 Degree Celsius Maximum Operating Temperature