General
Shrink ratio	3:1
Inner diameter	1.5 mm to 18 mm
Number of heat shrink tube sections	220
Number of sizes	5
Colour	Black
Material	Heat shrink tubing
Features	thin-walled, flexible, lightweight, space-saving, good fire protection properties
Packaging	Practical case

The HellermannTyton SHRINKIT 321 BASIC is a heat shrink tubing kit for use in electrical and IT trades, covering a wide range of cable protection and insulation applications. The kit contains 220 heat shrink tubing sections in five different sizes, with inner diameters ranging from 1.5 mm to 18 mm. The heat shrink tubes are designed with thin walls, making them flexible, lightweight, and space-saving. The 3:1 shrink ratio enables broad application, as the tubes shrink to one-third of their original diameter, creating increased clamping pressure. This ensures a secure and tight covering for cables and wires.

Applications
This heat shrink tubing kit is suitable for use in electrical installations, IT infrastructure, and machine building. It is used to protect, label, insulate, or bundle cables. The good fire protection properties make it suitable for applications in environments with increased safety requirements. The tubes are black, making them particularly suitable for use in technical installations and equipment.

Features and Equipment in Detail
The kit is delivered in a practical case, enabling organized storage and quick access to individual heat shrink tubing sizes. The tubes are available in five sizes, matching most common cable diameters. The total of 220 sections provides high availability for various projects. The heat shrink tubes are made from a material that shrinks when heated, forming a tight, shape-stable covering.

Technology Explained Simply
The heat shrink tubes operate on the principle of thermal deformation: when heated (e.g., with a hot air blower), they shrink and tightly enclose the cable or wire. The 3:1 ratio means the tube reduces to one-third of its original diameter, ensuring a tight fit and high clamping pressure. The thin-walled construction allows the tubes to bend easily and require little space, making them especially suitable for dense installations. The fire protection properties reduce the risk of flame spread along the cables.

Compatibility and Accessories
The SHRINKIT 321 BASIC is compatible with various hot air blowers used for shrinking heat shrink tubes. Compatible accessories include the SHRINKIT 321 Universal tubing set 3:1, the SHRINKIT 321-A tubing set 3:1 black/transparent, the SHRINKIT 321-A BASIC tubing set 3:1 with internal clamp black, and the CHG900-PA-GY gas hot air blower. These items can be used additionally to expand the application range or meet specific requirements.

Installation and Mounting
Installation is performed by sliding the heat shrink tube over the cable or wire and then heating it with a hot air blower. The shrinkage occurs evenly, creating a tight and shape-stable covering. The tubes are designed to be processed without additional tools or aids. The practical storage in the case facilitates selecting the correct size and transporting the kit to the worksite.

Operational Advantages
The combination of flexible construction, high number of heat shrink tubing sections, and the 3:1 shrink ratio offers high flexibility and efficiency during work. The good fire protection properties increase safety in use. The black-colored tubes blend visually into technical environments and are suitable for professional use. The practical packaging in the case ensures organized storage and quick access.