That 3mm cable running through your panel or down a wall chase is about to lose its jacket where it rubs. You need something that slides on, shrugs off the heat, and stays put. This 5m box of 3mm ID heatshrink does exactly that. Cut, slide, heatgun — joint's sealed and insulated in seconds. VW-1 flammability, RoHS and UL224 approved. The box is 49 x 177 x 165mm, so it slots into a drawer or sits on the bench without taking up room. Five metres covers a full day of mid-size cable repairs without a second trip to the store