---
product_id: 128116312
title: "21\" Caldwell Series 300 5/8\" Channel Block & Tackle Window Balance - Stamp 20-3"
brand: "window repair systems"
price: "€ 13.41"
currency: EUR
in_stock: false
url: https://www.desertcart.ie/products/128116312-21-caldwell-series-300-5-8-channel-block-and-tackle
store_origin: IE
region: Ireland
---

# 5/8" channel depth Metal construction 1 lb weight 21" Caldwell Series 300 5/8" Channel Block & Tackle Window Balance - Stamp 20-3

**Brand:** window repair systems
**Price:** € 13.41
**Availability:** ❌ Out of Stock

## Summary

> 🔍 Elevate Your Window Game!

## Quick Answers

- **What is this?** 21" Caldwell Series 300 5/8" Channel Block & Tackle Window Balance - Stamp 20-3 by window repair systems
- **How much does it cost?** € 13.41 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/128116312-21-caldwell-series-300-5-8-channel-block-and-tackle)

## Best For

- window repair systems enthusiasts

## Why This Product

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

## Key Features

- • **Durable Build:** Crafted from high-quality metal for long-lasting performance.
- • **Individual Sales:** Each balance sold separately, allowing for tailored replacements.
- • **Easy Installation:** Preinstalled guides simplify the setup process, saving you time.
- • **Measurement Matters:** Clear instructions for measuring ensure you get the right product.
- • **Precision Engineering:** Designed for non-tilt windows, ensuring a perfect fit every time.

## Overview

The 21" Caldwell Series 300 5/8" Channel Block & Tackle Window Balance is a precision-engineered solution for non-tilt windows. Weighing just 1 pound and made from durable metal, this product includes preinstalled guides for easy installation. Sold individually, it’s essential to verify measurements and sash weight before ordering to ensure a perfect fit.

## Description



## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Window Repair Systems |
| Manufacturer | Caldwell Manufacturing |
| Item Weight | 2 pounds |
| Material | Metal |

## Product Details

- **Brand:** Window Repair Systems
- **Material:** Metal
- **Item Weight:** 2 Pounds
- **Manufacturer:** Caldwell Manufacturing
- **UPC:** 609613870354

## Images

![21" Caldwell Series 300 5/8" Channel Block & Tackle Window Balance - Stamp 20-3 - Image 1](https://m.media-amazon.com/images/I/61+JDPv+dXL.jpg)
![21" Caldwell Series 300 5/8" Channel Block & Tackle Window Balance - Stamp 20-3 - Image 2](https://m.media-amazon.com/images/I/51ZYtxGMIGL.jpg)
![21" Caldwell Series 300 5/8" Channel Block & Tackle Window Balance - Stamp 20-3 - Image 3](https://m.media-amazon.com/images/I/416tOXanwzL.jpg)

## Questions & Answers

**Q: Cross index with swisco swc 385-21 2040?**
A: This is not the same part. This is stamped 20-3. The stamp you are looking for is 20-4.

**Q: If i measure the metal it’s 21 5/8” long, and the stamped with 21 3bsi 0e. what size should i get?**
A: You want the same. It should say 2130, 21-3. 21-30 or something like that. You can also substitute the 21 for 20 if you can’t find the 2130 try 2030 t will work just fine.

**Q: Is this listing for a pair or single?**
A: It is a single purchase

**Q: Can these support 40lb windows?**
A: No the spring isn't strong enough

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**Shop now:** [https://www.desertcart.ie/products/128116312-21-caldwell-series-300-5-8-channel-block-and-tackle](https://www.desertcart.ie/products/128116312-21-caldwell-series-300-5-8-channel-block-and-tackle)

---

*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-02-22*