127-Piece Heat Shrink Tubing Kit — Assorted Sizes for Electrical Wire & Cable

Select a tube whose expanded (pre-shrink) inner diameter is slightly larger than your wire or connector. After shrinking, the tubing typically reduces to about half its original diameter. For example, a 6mm (≈1/4") tube generally shrinks down to around 3mm (≈1/8"). When in doubt, size up — you can always apply more heat, but you can't un-shrink tubing.

This kit generally uses a 2:1 shrink ratio, meaning the tubing shrinks to approximately half its original inner diameter when heat is applied. This is the most common ratio for general-purpose electrical insulation and wire bundling tasks.

Yes. Polyolefin heat shrink tubing is generally resistant to moisture, UV exposure, and mild chemicals, making it suitable for automotive wiring repairs, marine connections, and outdoor electrical cable wrap. For particularly harsh environments such as constant submersion, confirm the specific tubing grade before use.

A heat gun is the recommended tool for even, controlled shrinking. In a pinch, a lighter can work for small diameters, but a heat gun provides more consistent results and reduces the risk of scorching. Most standard heat guns set to 90°C–200°C (195°F–390°F) will work effectively.

Yes. The assorted sizes in this kit are well-suited for car electrical repairs, including splicing wires, protecting connectors, and bundling cable harnesses. The tubing is typically rated to handle the temperature ranges found in standard automotive environments.

The kit includes 127 pieces in an assortment of sizes, typically ranging from approximately 1mm to 13mm in expanded inner diameter. Multiple lengths of each size are included so you have the right tube ready for a wide variety of wire gauges and connector types.

Absolutely. Each piece can be cut to any length with standard scissors or a utility knife before application. Heat shrink tubing does not shrink significantly in length, only in diameter, so your coverage area stays consistent.