It's the SmallRig Universal Lws Baseplate with Dual 15mm Rod Clamp 3357, a compact and lightweight solution designed to seamlessly integrate with mainstream Dslr and mirrorless camera cages. This versatile baseplate is compatible with dual 15mm rods, enabling the attachment of a variety of accessories such as lens support, follow focus, and matte box, enhancing your handheld and tripod shooting experiences. When paired with the Bmpcc 6K Pro Cage 3270, this baseplate ensures an optimal 85mm optical height, making it a valuable addition to your camera setup. One of its standout features is its specially-designed bottom, which allows for the effortless replacement of a Samsung T5 Ssd without the need to remove the baseplate, saving you time and effort during shoots. The baseplate is also designed with large built-in rubber pads to prevent scratching and twisting, ensuring the longevity of your equipment.