The Ultra Clamp with QD4XP Plate from 3 Legged Thing is a dual-action, Arca-type compatible clamp that gives photographers and filmmakers complete control over how they mount and adjust their gear. It comes with a QD4XP standard 1.5" Arca-type compatible quick release plate with a built-in quick detach socket, and two XPAND Connector slots.
It has a 3/8"-16 thread with a 1/4"-20 adapter and a square base that mounts onto any standard Arca-type head in four directions, providing L-bracket users a true vertical mount without the usual awkward workarounds. It has a dual-action adjustable lever that can be configured for left- or right-handed use and a knurled knob to dial in tension. Precision measurement markings on the clamp enable repeatable, accurate positioning, and a built-in security catch prevents accidental releases.