3.5" Long Dual Socket Arm with Anti-Theft Knob | DuraLock™ 20mm Metal Ball System | Black

11 reviews

  • 3.5" Arm Overall Length Measurement
  • 2.75" Ball Center to Ball Center Measurement
  • Optional Anti-Theft Knob: (PATENT PENDING) This arm, although not always necessary, has optional anti-theft features. This can (A) help prevent snatch and grab situations on your motorcycle, SXS, or other similar environments. (B) The ball cannot slip from the socket if not properly tightened.
  • Dual Socket Perfection: Although we have shorter arms available, the dual socket design will give you the largest range of articulation for perfect positioning.
  • Color Swap Compatible: Tackform offers a wide range of anodized billet aluminum knobs. This DuraLock arm is compatible with Tackform's DuraLock knobs, allowing you to customize your setup to match your vehicle. Black knob included.
  • Tackform 20 Series: Specifically designed for compatibility with Tackform’s 20 Series Platform, revolving around the 20mm ball and socket system. While compatible with other 20mm products, our parts stand out for their tested durability and engineered load capacities, featuring a safety factor not guaranteed by other manufacturers. Please Note: Not suitable for 25.4mm / 1” / B-Sized balls.



At Tackform, we are committed to providing you with top notch support.
If you have any questions or concerns about your order, please don't hesitate to reach out to our knowledgeable support technicians.

Our customer support team is available Monday through Friday 9:00 AM - 5:00 PM.


How long will it take to get my order?

  • USPS and Ground orders ship the same or next business day.
  • FedEx Express orders placed before 2 PM CST will ship same business day.
  • International orders, wholesale, and large bulk orders ay take an additional 1-2 business days for processing.

What shipping carriers do you use?

  • USPS
  • FedEx

Where do you ship from?

  • Tackform HQ (Addison Illinois 60101)

Can I return my product?

Of course, Tackform has a flexible 30 day return policy. You can find the full details by clicking here -> RETURNS


If we still haven't answered your questions, you can contact us below and we will get back to you as soon as possible.

"We're dedicated to providing you with the best possible shipping experience and we're here to help you in any way we can. Thank you for choosing Tackform. We look forward to serving you"

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Customer Reviews

Based on 11 reviews
Todd F. (Henderson, US)
Holds tight

2010 HD FLTRX. Very finicky about how the phone is positioned so it will charge. The new 3" locking pivot arm is different than the original one, in that it's not as flexible with the rotation. I went back to the original arm so I can better tweak my angles. It would have gained a ⭐ had it not been for that.

Hi Todd, did you adjust the bottom support leg on the holder? The coils for wireless charging may be misaligned if you're experiencing issues. The new arm takes a bit of force on the dovetail connection side to adjust its axis. This was intentional to secure that axis once you've found the right placement. Thanks!

Mcafee (Palmyra, US)

Product fits great love look . High quality would highly recommend to anyone

Mike R. (Aurora, US)
Great service

Andrew did an awesome job of answering my questions and getting the right parts for my vent phone mount for my Tacoma.

Sean L. (Minneapolis, US)
Goes hard

It’s tight, rigid, and lasting

Wesley G. (Carrollton, US)

I went for 175 mi. ride with a mixture of dirt, gravel, and pavement. The phone mount and extension arm did great.