Hellermanntyton shrinkit 321 universal set 975 pieces 380 03002 hellermann tyton 380 03002 p the hellermanntyton shrinkit 321 heat shrink tubing is one versatile product not only does it provide your cables with protection against abrasion chemical and weather it s also great for bundling colour coding and strain relief insulating your cables with heat shrink tubing will give your project great results p p this shrinkit has a shrink ratio of 3 1 and suitable for an array of appli