The Manfrotto Sympla Universal Mount is the basic structural element for numerous Sympla components (eg the Flexible Mattebox, Shoulder Pad, V-Offset, Body & Lens Supports & Adjustable handles all attach to SYMPLA Rods via Universal Mounts) & it can also support external accessories. The universal mount is a self-hanging clamp that slides along Sympla rails & locks in position with a single locking lever. A single, repositionable locking lever conveniently blocks the Universal Mount solidly against both rails with one movement. The Universal Mount is extremely versatile, thanks to its industry standard 4 x 3/8 female threads & 2 x 1/4 female threads, which can be used to attach arms, adaptors & other components & accessories to a SYMPLA rig.