Mobile phone/smartphone clamp Ulanzi ST-27 — universal phone holder, colors Black and Red

Ulanzi ST-27 is a universal mobile phone clamp designed to hold smartphones securely for vlogging, live streaming and general hands‑free use. Made from aluminum alloy, the clamp offers a standard Arca quick‑release compatible base and multiple mounting options to adapt to tripods, rigs and on‑camera accessories. Available in black and red, the ST-27 is built for steady phone shooting and accessory expansion.

Advantages

The ST-27 provides an all‑metal body for durability, a standard Arca mount on the bottom for fast attachment to compatible plates and a 1/4" screw port for tripods. It includes a back cold shoe and two side cold shoes to mount microphones and fill lights simultaneously, plus two 1/4" expansion holes for additional accessories. The clamp’s wide opening and locking clip accommodate most modern smartphones.

Suitable for

• Vloggers and content creators filming with a smartphone
• Live streaming on Facebook, YouTube and other platforms
• Mobile phone mounting on tripods, rigs or Arca‑style plates
• Recording with external microphones and on‑camera lights

When it may not be suitable

The ST-27 is intended for smartphones and lightweight accessories; it may not be suitable if you need to mount very heavy professional cameras or large, heavy rigs. Extremely bulky phone cases or accessories that exceed the clamp’s maximum opening may prevent a secure fit.

Key specifications

• Material: aluminum alloy (all metal body)
• Mounts: standard Arca quick‑release base and 1/4" tripod screw port
• Accessory mounts: back cold shoe, two side cold shoes
• Expansion: two 1/4" screw holes for accessories
• Maximum clamp opening (lock clip distance): up to 89 mm
• Colours: Black, Red

How to use

Open the clamp to fit your smartphone, position the device centrally and tighten the locking clip until the phone is held firmly. Attach the Arca base or use the bottom 1/4" port to mount the clamp on a tripod or plate. Use the back and side cold shoes to add a microphone or fill light, and secure additional accessories with the two 1/4" expansion holes as required.

What to consider before purchase

• Measure your phone and any case to ensure the clamp’s maximum opening (up to 89 mm) is sufficient
• Confirm your tripod or plate compatibility with Arca‑style mounts or 1/4" screw ports
• Check total accessory weight to ensure the all‑metal clamp can support your setup

Usage recommendations

For stable vlogging and streaming, mount the phone centrally on the ST-27, use the side cold shoes for a microphone and a small LED light, and secure the clamp on an Arca‑compatible plate or tripod via the 1/4" port.