---
product_id: 244774755
title: "300 PCS 3:1 Ratio Heat Shrink Tubing Kit, 5 Sizes (Diameter): 1/8, 1/4, 3/16, 3/8, 1/2 Inch, Electric Wire Cable Wrap Assortment Electric Insulation Heat Shrink Tube Kit with Box (Black & Red)"
brand: "koowin"
price: "₨7371"
currency: LKR
in_stock: true
reviews_count: 8
category: "Koowin"
url: https://www.desertcart.lk/products/244774755-300-pcs-3-1-ratio-heat-shrink-tubing-kit-5
store_origin: LK
region: Sri Lanka
---

# 600V electrical insulation 3:1 shrink ratio for precise fit Operates -40°C to 125°C 300 PCS 3:1 Ratio Heat Shrink Tubing Kit, 5 Sizes (Diameter): 1/8, 1/4, 3/16, 3/8, 1/2 Inch, Electric Wire Cable Wrap Assortment Electric Insulation Heat Shrink Tube Kit with Box (Black & Red)

**Brand:** koowin
**Price:** ₨7371
**Availability:** ✅ In Stock

## Summary

> 🔥 Shrink it, seal it, own it — the ultimate wire wrap upgrade!

## Quick Answers

- **What is this?** 300 PCS 3:1 Ratio Heat Shrink Tubing Kit, 5 Sizes (Diameter): 1/8, 1/4, 3/16, 3/8, 1/2 Inch, Electric Wire Cable Wrap Assortment Electric Insulation Heat Shrink Tube Kit with Box (Black & Red) by koowin
- **How much does it cost?** ₨7371 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/244774755-300-pcs-3-1-ratio-heat-shrink-tubing-kit-5)

## Best For

- koowin enthusiasts

## Why This Product

- Trusted koowin brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **All-in-One Kit:** 300 pieces across 5 sizes neatly packed for every DIY or pro project
- • **Built for Extremes:** Withstands temperatures from -40°C to 125°C for reliable durability
- • **Shrink to Perfection:** 3:1 ratio ensures a snug, professional finish every time
- • **Power-Proof Protection:** Rated for 600V, safeguarding your wiring with top-tier insulation
- • **Color-Coded Convenience:** Dual black & red tubes for easy wire identification and organization

## Overview

The KOOWIN 300 PCS Heat Shrink Tubing Kit offers a versatile 3:1 shrink ratio with 5 diameter sizes, operating reliably between -40°C and 125°C. Rated for 600V insulation, this kit includes 300 durable polyolefin tubes in black and red, perfect for professional-grade electrical insulation, wire marking, and protection. Packaged in a convenient box, it’s designed for fast, precise application with a heat gun, making it an essential upgrade for any tech-savvy DIYer or professional.

## Description

KOOWIN 300 PCS 3:1 Ratio Heat Shrink Tubing Kit, 5 Sizes (Diameter): 1/8, 1/4, 3/16, 3/8, 1/2 Inch, Electric Wire Cable Wrap Assortment Electric Insulation Heat Shrink Tube Kit with Box (Black & Red): desertcart.com: Industrial & Scientific

Review: Great Selection - I needed to put some heat shrink on some small tools, and didn't know what size to use. I ended up using quite a few of the colors and sizes for my project, and could not have been more pleased with the quality and diverse selection in the package. The heat shrink worked very well using my heat gun, and they could be cut to size. I used both colors for the different type of tools I had, and was done in a very short period of time.
Review: Good value - I have used several of these shrink tubes and they work well. Good value for the price.

## Features

- 【Product Parameter】High Quality Shrinkage Ratio: 3:1(will shrink to 1/3 its supplied diameter), Operating Temperature: -40°C to 125°C, Shrink Temperature: 70℃-125℃, Withstand Voltage: 600V
- 【Multifunctional and DIY assistant】High-quality heat shrinkable tubes are available in a variety of sizes and can be used for solder connection protection, wire group marking, resistance and capacitance cause protection, etc.
- The plastic box includes 300 pcs of heat shrink tube in two colors (Black & Red) and 5 different specifications to meet your various needs. The heat shrinkable tube with a length of 1-1/2 inch has a diameter of 1/8", black & red 40 PCS, 3/16", black 40PCS, 1/4", black 40 PCS, 3/8", black 40 PCS, length 3-1/2 inch heat shrinkable tube has a diameter of 1/4" black & red each 15 PCS, 3/16" black & red each 15 PCS, 3/8" black & red each 15 PCS, 1/2" black & red each 10 PCS
- 【Easy to Use】This heat shrinkable tube offers excellent electrical insulation, corrosion resistance, and high temperature resistance. It features a soft wire shrink sleeve with a low minimum shrink temperature of 158℉ (70°C), fast shrinkage, easy to use heat gun
- 【30-Day Refund】All customers enjoy 30-day refund & one-year warranty service. If the customer is not satisfied with the purchase for any reason, the product can be returned or refunded

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08GXCHVVF |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #52,044 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #150 in Industrial Heat-Shrink Tubing |
| Brand | KOOWIN |
| Color | Black &Red |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,205) |
| Date First Available | November 1, 2020 |
| Is Discontinued By Manufacturer | No |
| Item Length | 1.5 Inches |
| Item Weight | 7.4 ounces |
| Item model number | 1 |
| Manufacturer | KOOWIN |
| Material | Polyolefin |
| Part Number | 1 |
| Product Dimensions | 3.5"L x 0.25"W |
| Shape | Round |
| Size | Ratio 3:1 |
| UPC | 751300527437 |

## Product Details

- **Brand:** KOOWIN
- **Color:** Black &Red
- **Item Length:** 1.5 Inches
- **Item Weight:** 0.21 Kilograms
- **Manufacturer:** KOOWIN
- **Material:** Polyolefin
- **Product Dimensions:** 3.5"L x 0.25"W
- **UPC:** 751300527437

## Images

![300 PCS 3:1 Ratio Heat Shrink Tubing Kit, 5 Sizes (Diameter): 1/8, 1/4, 3/16, 3/8, 1/2 Inch, Electric Wire Cable Wrap Assortment Electric Insulation Heat Shrink Tube Kit with Box (Black & Red) - Image 1](https://m.media-amazon.com/images/I/61TaQmTIvuL.jpg)

## Questions & Answers

**Q: What ratio should i choose to use them as protection for a type c cell phone cable?**
A: Any that can fit over the end but 3-1 I recommend.

**Q: Is this marine grade?**
A: It does not specify that it is marine grade anywhere in the product description.

**Q: Is there glue inside or waterproof**
A: There is no glue in this, it’s not doubled walled.

**Q: Are the sizes the *diameters* of the round tubing, or the width when folded flat? (Some sellers mislist the flat width as "diameter")**
A: The diameter of the heat shrink tube is the diameter of the round tube. We flatten it in order to put more products, thank you.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Selection
*by L***R on July 13, 2025*

I needed to put some heat shrink on some small tools, and didn't know what size to use. I ended up using quite a few of the colors and sizes for my project, and could not have been more pleased with the quality and diverse selection in the package. The heat shrink worked very well using my heat gun, and they could be cut to size. I used both colors for the different type of tools I had, and was done in a very short period of time.

### ⭐⭐⭐⭐⭐ Good value
*by W***0 on April 26, 2025*

I have used several of these shrink tubes and they work well. Good value for the price.

### ⭐⭐⭐⭐ OK Quality, Decent Price, Mostly Good - NOT 3:1 ADHESIVE if that is what you were looking for
*by D***R on May 27, 2024*

This is OK. It shrinks like it should when light to moderate hot air is applied. I would NOT recommend using a lighter or open flame to shrink this tubing. Use low to moderate heat applied from 3-6” away. The cons: lettering is applied to the tubing and noticeable when using RED. The wall thickness is less than some other brands available. Regardless of the cons, this product does what the tin advertises. It shrinks when you apply low to moderate heat, comes in various diameters, the included divided box it comes in is nice and the price is fair. This seems ideal for light to moderate duty hobby work and the occasional automotive project. It is not water tight but should offer some short-term protection against the elements (situationally dependent, of course). It a bad purchase and the price was reasonable. If you are realistic with your expectations and understand it’s limitations, this could be just fine for you.

## Frequently Bought Together

- KOOWIN 300 PCS 3:1 Ratio Heat Shrink Tubing Kit, 5 Sizes (Diameter): 1/8, 1/4, 3/16, 3/8, 1/2 Inch, Electric Wire Cable Wrap Assortment Electric Insulation Heat Shrink Tube Kit with Box (Black & Red)
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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-03-04*