3M Thin-Wall Polyolefin Heat Shrink Tubing FP 301 1/2" Black 4-in pieceGeneral Information Brand 3M Country Of Origin United States Sold As Case Lead Time 33 days California Residents Proposition 65 Warning Return Policy NCNR Non Cancellable Non Returnable Dimensions and Specifications Inner Diameter After Shrink (Imperial) 0. 25 in Inner Diameter After Shrink (Metric) 6. 35 mm Inner Diameter Before Shrink (Imperial) 0. 5 in Inner Diameter Before Shrink (Metric) 12. 7 mm Maximum Operating Temperature (Celsius) 135 Degree