This heat shrink kit is very suitable for any workshop project, repairing broken wires, electrical insulation, mechanical protection, bandwidth, connecting wires, process wire ends, splices of wire/cable, daily repairs, color coding, etc. The shrink ratio for these heat shrink tubing is 2:1, made of polyolefin, good electrical insulation or insulation of open wires or wires connected. Heat shrink tube length: 45mm, inner diameter: 1mm/1.5mm/2mm/2.5mm/3mm/3.5mm/4mm/5mm /6mm/7mm/10mm/13mm. Assortment of heat shrink tubing with different colors: 5 colors (yellow, blue, black, green, red) in a 12 compartment organizer, ideal for home and automotive DIY enthusiasts. Easy to use, cover the stripped part of the wire with these tubes, heat it with a soldering iron, heat gun or even a hair dryer x (pretty hot), the tube shrinks to protect the threads and give you a professional look of the repair job