The 8Sinn 15mm Baseplate is ARRI dovetail compatible and supports optional camera-specific riser plates from 8Sinn. Available plates include the Riser Plate Basic, which supports the URSA Mini, C100, and Sony FX-9 cameras, and the Riser Plate I, which is for select 8Sinn Z CAM, a7/a7R, and Blackmagic Pocket 4K/6K cages. These optional plates set the supported cameras at the appropriate optical center on the 15mm Baseplate.

The 15mm Baseplate features 15mm LWS rod support via front and rear rod ports and a tightening lever on the left and right sides. The left side has a second lever, and this is for securing the compatible riser plate. The 15mm Baseplate offers two ARRI rosette mounts for attaching optional handgrips, and it also provides a section with multiple 1/4"-20 accessory mounting threads. The baseplate is made with excess weight cut out to provide a minimalist, lightweight design.