---
product_id: 88990456
title: "Knobonly 2 Pairs Undermount Drawer Slides 21 Inch, Soft 3 Folds Close Full Extension, 85lb Load Capacity, Easy Mount Rails with All Hardware for Kitchen Bathroom Drawers"
brand: "knobonly"
price: "$156.29"
currency: USD
in_stock: true
category: "Knobonly"
url: https://www.desertcart.us/products/88990456-knobonly-2-pairs-undermount-drawer-slides-21-inch-soft-3
store_origin: US
region: United States of America
---

# 21-inch full extension soft-close mechanism 85lb load capacity Knobonly 2 Pairs Undermount Drawer Slides 21 Inch, Soft 3 Folds Close Full Extension, 85lb Load Capacity, Easy Mount Rails with All Hardware for Kitchen Bathroom Drawers

**Brand:** knobonly
**Price:** $156.29
**Availability:** ✅ In Stock

## Summary

> 🔧 Upgrade your drawers to pro-level smoothness and strength!

## Quick Answers

- **What is this?** Knobonly 2 Pairs Undermount Drawer Slides 21 Inch, Soft 3 Folds Close Full Extension, 85lb Load Capacity, Easy Mount Rails with All Hardware for Kitchen Bathroom Drawers by knobonly
- **How much does it cost?** $156.29 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/88990456-knobonly-2-pairs-undermount-drawer-slides-21-inch-soft-3)

## Best For

- knobonly enthusiasts

## Why This Product

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

## Key Features

- • **Heavy-Duty Strength:** Supports up to 85 lbs for your heaviest drawers without compromise.
- • **Full-Access Extension:** Enjoy complete 21-inch drawer pull-out for maximum reach and convenience.
- • **Sleek Undermount Design:** Concealed rails save space and elevate your kitchen or bathroom aesthetics.
- • **Whisper-Quiet Soft-Close:** Experience smooth, slam-free drawer closing every time.
- • **All-Inclusive Installation Kit:** Comes with every screw and bracket needed for a hassle-free upgrade.

## Overview

Knobonly’s 21-inch undermount drawer slides combine heavy-duty alloy steel construction with a soft-close mechanism, supporting up to 85 lbs. Designed for full extension and wobble-free operation, they come with a complete installation kit for easy mounting in kitchens, bathrooms, or offices, delivering a sleek, space-saving upgrade that prevents drawer slams and enhances durability.

## Description

Knobonly 2 Pairs Undermount Drawer Slides 21 Inch, Soft 3 Folds Close Full Extension, 85lb Load Capacity, Easy Mount Rails with All Hardware for Kitchen Bathroom Drawers - desertcart.com

## Features

- Heavy-Duty Construction & Smooth Soft-Close: Made from high-grade cold-rolled steel with zinc plating for lasting durability. These full-extension slides support loads up to 85 lbs and feature a reliable soft-close mechanism that gently and quietly closes drawers every time, preventing slam and enhancing safety
- Precise Fit & Complete Installation Kit: This set includes 2 pairs of slides (4 pieces total), along with a full set of matching installation hardware: all necessary mounting screws, 2 pairs of adjustable locking devices, 2 pairs of rear mounting brackets, and installation instructions. Designed for a 21" drawer length and fits cabinet depths of 22.3"-23.1" (566-586mm), allowing for the simultaneous upgrade of two drawers
- Full Extension & Stable, Wobble-Free Operation: Achieve full access with a smooth 455mm (18”) pull-out length. The reinforced design and robust construction ensure stable, side-to-side wobble-free movement even when fully extended, protecting your drawer fronts from scraping against adjacent surfaces
- Universal Undermount Application & Space-Saving Design: The concealed bottom-mount design saves interior space and offers a clean, modern look. Versatile for use in kitchen, bathroom, office, or storage furniture. Important Note: Ensure proper side clearance (typically 1/2” to 1”) between the drawer box and cabinet interior for optimal function
- Reliable Support & Satisfaction Guarantee: We stand by our product quality. If you encounter any issues with product performance or installation, please contact our responsive customer service within 24 hours for assistance, replacement, or refund

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BB24QZDQ |
| Best Sellers Rank | #307,994 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #607 in Cabinet & Furniture Drawer Slides |
| Brand Name | Knobonly |
| Color | Silver |
| Customer Reviews | 3.9 3.9 out of 5 stars (29) |
| Drawer Type | Storage |
| Finish Types | Steel |
| Included Components | Case |
| Item Type Name | cabinet-and-furniture-drawer-slides |
| Manufacturer | Knobonly |
| Manufacturer Part Number | UP-533H-DSHH-2Pair |
| Material Type | Alloy Steel |
| Maximum Weight Capacity | 85 pounds |
| Mounting Type | Under Mount |
| Number of Items | 2 |
| Number of Packs | 2 |
| Unit Count | 4 Count |

## Product Details

- **Brand:** Knobonly
- **Color:** Silver
- **Finish Type:** Steel
- **Material:** Alloy Steel
- **Mounting Type:** Under Mount

## Images

![Knobonly 2 Pairs Undermount Drawer Slides 21 Inch, Soft 3 Folds Close Full Extension, 85lb Load Capacity, Easy Mount Rails with All Hardware for Kitchen Bathroom Drawers - Image 1](https://m.media-amazon.com/images/I/71OvWanRYRL.jpg)
![Knobonly 2 Pairs Undermount Drawer Slides 21 Inch, Soft 3 Folds Close Full Extension, 85lb Load Capacity, Easy Mount Rails with All Hardware for Kitchen Bathroom Drawers - Image 2](https://m.media-amazon.com/images/I/71N8fN9+vDL.jpg)
![Knobonly 2 Pairs Undermount Drawer Slides 21 Inch, Soft 3 Folds Close Full Extension, 85lb Load Capacity, Easy Mount Rails with All Hardware for Kitchen Bathroom Drawers - Image 3](https://m.media-amazon.com/images/I/81ngpKwo5tL.jpg)
![Knobonly 2 Pairs Undermount Drawer Slides 21 Inch, Soft 3 Folds Close Full Extension, 85lb Load Capacity, Easy Mount Rails with All Hardware for Kitchen Bathroom Drawers - Image 4](https://m.media-amazon.com/images/I/81fm-9ChABL.jpg)
![Knobonly 2 Pairs Undermount Drawer Slides 21 Inch, Soft 3 Folds Close Full Extension, 85lb Load Capacity, Easy Mount Rails with All Hardware for Kitchen Bathroom Drawers - Image 5](https://m.media-amazon.com/images/I/71J+OFrsXNL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Frequently Bought Together

- 10 Pair 21" Undermount Drawer Slides Soft Close Full Extension Drawer Rails, Mounting Screws and Adjustable Locking Device Included
- Ravinte 60 Pack 30 Pairs 1/2 inch Overlay Soft Close Hinges for Kitchen Cabinet Hinges Satin Nickel Hidden Hinges Stainless Steel Concealed Hinge self Closing
- Knobonly 10 Pair 18" Undermount Drawer Slides Soft Close Full Extension Drawer Rails, Mounting Screws and Adjustable Locking Device Included, 85 lb Load Capacity, Zinc Plated Cold Rolled Steel

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-08-06*