The 202D221-4/42-0 from TE Connectivity / Raychem Brand is black color heat shrink boot with shell size 21 and adhesive coating. This heat shrink boot has 1.012" (25.70mm) to 0.591" (15.00mm) large diameter and 1.012" (25.70mm) to 0.291" (7.39mm) small diameter. This is polyolefin (PO), flexible, irradiated heat shrink boot with length of 4.772" (121.21mm). Operating temperature range is from -20 to 60 °C (-4 to 140 °F).