Really Right Stuff BA7R4-L SET-V1 Overview The L-Plate Set for Sony Alpha a7R IV from Really Right Stuff is a modular design composed of an Arca-type compatible base plate and L-component that facilitate easier, more stable switching between horizontal and vertical shooting orientations when working on top of a tripod. The CNC-machined 6061-T6 aluminum L-plate set maintains complete access to the battery door without obstructing the tilting LCD monitor of the camera. Plus, the L-plate set has been type II black anodized, which makes it resistant to scuffs and scratches. Furthermore, the base plate has laser-engraved center marks on the back to align it on a tripod head. Use of them does not imply any affiliation with or endorsement by them.