---
product_id: 22559505
title: "Stanley Proto J7111 3/8-Inch Square Extension, 7/16-Inch Hex"
brand: "proto"
price: "$44.54"
currency: USD
in_stock: true
category: "Proto"
url: https://www.desertcart.us/products/22559505-stanley-proto-j7111-3-8-inch-square-extension-7-16
store_origin: US
region: United States of America
---

# Size stamped for quick ID Ball detent secure fit Forged steel durability Stanley Proto J7111 3/8-Inch Square Extension, 7/16-Inch Hex

**Brand:** proto
**Price:** $44.54
**Availability:** ✅ In Stock

## Summary

> 🔧 Elevate your toolkit with precision-crafted power!

## Quick Answers

- **What is this?** Stanley Proto J7111 3/8-Inch Square Extension, 7/16-Inch Hex by proto
- **How much does it cost?** $44.54 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/22559505-stanley-proto-j7111-3-8-inch-square-extension-7-16)

## Best For

- proto enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** Crafted from premium forged alloy steel for unmatched strength and longevity.
- • **Precision Fit:** Ball detent mechanism ensures a secure, wobble-free connection every time.
- • **Impact Caution:** Designed specifically for hand-powered use—engineered precision without impact wear.
- • **Made in the USA:** Proudly manufactured domestically, guaranteeing quality and reliability.
- • **Instant Identification:** Size clearly stamped on the tool, eliminating guesswork and saving time on the job.

## Overview

The Stanley Proto J7111 is a 3/8-inch square extension with a 7/16-inch hex shank, forged from durable alloy steel and finished with a brushed surface. Featuring a ball detent for secure bit retention and size stamping for quick identification, this USA-made tool is optimized for hand-powered applications, delivering reliable performance for professional-grade projects.

## Description

Stanley J7111 Proto 3/8-inch Square Extension 7/16-inch Hex Made of forged steel. Size stamped on tool for easy identification. Ball detent. Not for use on impact applications.

## Features

- Made of forged steel.
- Size stamped on tool for easy identification.
- Ball detent.
- Not for use on impact applications.
- Made in USA

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001HWAG2C |
| Best Sellers Rank | #431,618 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,328 in Hex Keys |
| Bit Compatibilities | 3/8 inch square, 7/16 inch hex |
| Bit Set Composition | Single Bit |
| Brand Name | Proto |
| Customer Reviews | 4.4 4.4 out of 5 stars (101) |
| Drive Bit Shank Style | Hex |
| Drive End Style | Square Shank |
| Drive System | Hex, Square |
| Finish Types | Brushed |
| Global Trade Identification Number | 00662679330231 |
| Included Components | 1 Proto Branded Tool |
| Item Length | 0.44 inches |
| Item Type Name | Proto Tool |
| Item Weight | 2.08 ounces |
| Manufacturer | Stanley Proto |
| Manufacturer Part Number | J7111 |
| Manufacturer Warranty Description | Manufacturer |
| Material Type | Alloy Steel |
| Model Number | J7111 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Number of Pieces | 1 |
| UPC | 662679330231 |

## Product Details

- **Brand:** Proto
- **Finish Type:** Brushed
- **Item Length:** 0.44 inches
- **Material:** Alloy Steel
- **Number of Pieces:** 1

## Images

![Stanley Proto J7111 3/8-Inch Square Extension, 7/16-Inch Hex - Image 1](https://m.media-amazon.com/images/I/51zoVf20ajL.jpg)
![Stanley Proto J7111 3/8-Inch Square Extension, 7/16-Inch Hex - Image 2](https://m.media-amazon.com/images/I/21J+W7kBd-L.jpg)
![Stanley Proto J7111 3/8-Inch Square Extension, 7/16-Inch Hex - Image 3](https://m.media-amazon.com/images/I/61uP9bhAFML.jpg)

---

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**Shop now:** [https://www.desertcart.us/products/22559505-stanley-proto-j7111-3-8-inch-square-extension-7-16](https://www.desertcart.us/products/22559505-stanley-proto-j7111-3-8-inch-square-extension-7-16)

---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-11-14*