The Phil Multi-Functional Smartphone Holder and Mount from 3-Legged Thing is a robust and versatile smartphone holder and mount with an integrated Arca-Swiss base that is compatible with most tripod heads, 3LT's Camera Desk Mount System, Pivot Magic Arms, and a range of other accessories. The jaws of the clamp are lined with rubber to securely hold any smartphone from 2.3 to 3.5" wide without marring the finish. The wing knob on the rear support opens and locks the extending clamp into place, while the knurled ring releases and locks the portrait to landscape rotation function. The adjustable clamp is lined with rubber to protect the sides of smartphones. The clamp is controlled by a dual lock on the rear. A large wing knob opens and locks the extending clamp into place, whilst the knurled ring releases and locks the portrait-to-landscape rotation function. Perfect for content creators, the Phil Multi-Functional Smartphone Mount is made from robust aerospace-grade magnesium alloy and features a cold-shoe mount at either end of the clamp. It has a 3/8"-16 accessory thread with 1/4"-20 adapter in the back for attaching accessories.