40 Pieces Heat Shrink Tubing Kit 4mm Diameter 40mm Length 2 To 1 Shrink Ratio Black Polyolefin Electrical Tubing For Wiring Harness Insulation And Waterproof Protection Ideal For DIY Electronics And Batch Shrinkage

40-Piece Heat Shrink Tubing Kit for DIY Electronics
✔️ 4mm dia, 40mm length, 2:1 shrink, black polyolefin

This heat shrink tubing kit includes 40 pieces of 4 mm diameter, 40 mm long black heat shrink tubes, ideal for insulating and protecting wiring harnesses in DIY electronics projects. Each tube shrinks to 2:1, providing a snug, waterproof seal on cables and joints, while stored neatly in a plastic box for easy batch work.

✅ 40 pieces included for multiple builds
✅ 4 mm diameter tubes fit common wiring sizes
✅ 2:1 shrink ratio for tight, reliable insulation
✅ Polyolefin material offers flame retardant insulation and flexibility
✅ Rated up to 600V for electrical safety and durability
✅ Temperature range -55°C to 125°C; full shrink at 110°C

💡 What is a heat shrink tubing kit used for in electrical projects? It's handy for insulating, protecting, and waterproofing connections. - Insulates solder joints and wire ends to prevent moisture ingress - Seals and protects cable harnesses and connectors during assembly - Shields headphones, USB cables, and device leads from wear - Quick field repairs with secure, durable insulation