HomElectrical.com Lighting & Electrical Supply Superstore

Proto 7/16" Alloy Steel Hex Shank Extension

Proto 7121
SKU PRO-7121
Proto 7/16" Alloy Steel Hex Shank Extension

Image may not depict product actual color, inclusions or accessories

This 7/16 inch hex shank extension has precision machined tips for proper fastener engagement. Its one piece construction ensures concentricity while its special heat treat ensures long life.

  • Drive Size: 1/2 in (male square), 7/16 in (male hex).
  • Overall Length: 2 3/4 in.
  • Locking Type: Pin.
  • Material: Alloy Steel.
  • Finish: Nickel Chrome.

Similar Hex Key Wrench & T-Handle Key Products

Proto 7121 Description

This 7/16 inch hex shank extension has precision machined tips for proper fastener engagement. Its one piece construction ensures concentricity while its special heat treat ensures long life.

  • Drive Size: 1/2 in (male square), 7/16 in (male hex).
  • Overall Length: 2 3/4 in.
  • Locking Type: Pin.
  • Material: Alloy Steel.
  • Finish: Nickel Chrome.

Similar Hex Key Wrench & T-Handle Key Products

$10.41Each
In Stock-

Ships between 02/25/2026 - 02/27/2026

Proto
Visit The Proto Store

Product Specifications

Part Number7121, 577-7121
Weight0.18-lb
UPC662679340155

Shop Top 100 Tools & Hardware Products.

View other Hex Key Wrench & T-Handle Key Best Sellers.

Manufacturer Description

7/16" Hex Shank Extension

  • One piece construction ensures concentricity. Special heat treat ensures long life. Precision machined tips for proper fastener engagement
  • Finish: Nickel Chrome
  • Material: Alloy Steel
Prop65
Important PROP 65 InformationWarning: This product can expose you to chemicals, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov. to CA residents.
Proto 7/16" Alloy Steel Hex Shank Extension
$10.41Each
In Stock-

Ships between 02/25/2026 - 02/27/2026

Similar Hex Key Wrench & T-Handle Key Products

Proto 7121 Description

This 7/16 inch hex shank extension has precision machined tips for proper fastener engagement. Its one piece construction ensures concentricity while its special heat treat ensures long life.

  • Drive Size: 1/2 in (male square), 7/16 in (male hex).
  • Overall Length: 2 3/4 in.
  • Locking Type: Pin.
  • Material: Alloy Steel.
  • Finish: Nickel Chrome.

Product Specifications

Proto
Visit The Proto Store
Part Number7121, 577-7121
Weight0.18-lb
UPC662679340155

Shop Top 100 Tools & Hardware Products.

View other Hex Key Wrench & T-Handle Key Best Sellers.

Manufacturer Description

7/16" Hex Shank Extension

  • One piece construction ensures concentricity. Special heat treat ensures long life. Precision machined tips for proper fastener engagement
  • Finish: Nickel Chrome
  • Material: Alloy Steel
Prop65
Important PROP 65 InformationWarning: This product can expose you to chemicals, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov. to CA residents.

Product Questions & Answers

Customer Reviews

Your voice matters. Be the first to leave a review and help other pros shop smarter

Write A Review
Need Assistance?

Never Stop Saving!

With HomElectrical, you are not just buying a product, you are investing in a solution. Our goal is to help you make the most educated choice possible, ensuring maximum savings on every job. We provide the deep product knowledge for all your Electrical, HVAC, and Lighting projects. By promoting efficiency and supporting every purchase with high-quality service, we help save your business money and support a greener future.