17mm Ball Joint Extension Arm for Car Phone Mount – 360° Rotation

Extend & Reposition Your Car Phone Mount with Ease

The 17mm Ball Joint Extension Arm is the perfect accessory upgrade for your car vent phone holder. This compact female-to-male adapter adds flexible reach and smooth 360° rotation, letting you position your phone at exactly the right angle for hands-free navigation, calls, or media — all without obstructing your view.

Whether your current mount sits too close to the dash or at an awkward angle, this extension arm gives you the adjustability you need. Compatible with virtually any standard 17mm ball joint car phone holder system, it's a universal solution that works right out of the box.

Key Features

• 360° Full Rotation — Freely adjust your phone to portrait or landscape orientation with smooth, click-free motion
• 17mm Ball Joint Compatibility — Fits the universal 17mm ball joint standard used by most car vent and dashboard phone mounts
• Female-to-Male Adapter Design — Seamlessly extends your existing mount setup without any tools required
• Durable Plastic Construction — Lightweight yet sturdy enough to hold your phone mount securely while driving
• Universal Fit — Compatible with all major smartphone brands and most standard car phone holder accessories
• Compact & Discreet — Low-profile design that blends naturally into your car's interior

Specifications

• Brand: Untoom
• Model Number: C-288-C-A
• Ball Joint Size: 17mm
• Connection Type: Female to Male
• Material: Plastic
• Rotation: 360°
• Country of Origin: Made in Mainland China

Perfect Pairing

Looking to complete your in-car organization setup? Check out these great accessories from our store:

• Tactical Retractable Spring Rope Keychain Lanyard – Outdoor — Keep your keys and essentials tethered and ready to go
• 10-Pack Silicone Cable Ties – Reusable Cord Organizers — Tidy up charging cables and cords in your car

Learn more: FuelEconomy.gov on vehicle maintenance

Frequently Asked Questions

Q: What size ball joint does this extension arm fit?

A: This extension arm is designed for the standard 17mm ball joint size, which is the most widely used size among car vent phone mounts and dashboard holders. It features a female-to-male adapter design, allowing it to connect directly between your mount base and phone holder head.

Q: Is this extension arm compatible with all car phone mounts?

A: It is universally compatible with any car phone mount or holder that uses a 17mm ball joint system. This covers the vast majority of aftermarket car vent mounts, suction cup mounts, and dashboard holders available today, regardless of the smartphone brand.

Q: Does it require any tools or installation?

A: No tools are needed. The extension arm simply connects between your existing mount components using the standard ball joint connection. Installation takes just seconds — simply click it into place and adjust your preferred angle.

Q: Will the arm hold its position while driving?

A: Yes. The ball joint mechanism is designed to lock securely into position, maintaining your preferred viewing angle even on bumpy roads. The durable plastic construction ensures a firm, stable hold throughout your journey.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.