Professional grade military spec flexible polyolefin tubing provides excellent electrical insulation, protection from dirt, dust, solvents, and foreign materials as well as providing strain relief. Over expanded tubing easily fits over the end of wires and connectors and shrinks down to 33 of it's original diameter for a snug water - tight protective seal without a reduction in the tube's original length.Hi - Temp Shrink Tubes can be used to insulate wires, wire splicing, connections, terminals and meets the material functional properties of Military Spec DTL - 230535C. 31 shrink ratio Operating temperature range - 67F to 275F Apply at 120F to 180F using a heat gun DO NOT apply directly to exhaust components.