Configure your BCD to meet your needs with the Monorail Multi-Mount Accessory Plate Set. Built for the Hydros Pro 2, it enables you to mount accessories above or below the Monorail and weight pocket. One set is needed for each side of the BCD and is easily mounted to the Monorail system. You can mount the plates on the left, right or both sides, creating a versatile system for attaching a knife, the popular roll-out Ninja Pocket or the Hydros Accessory Bungee Sets that are great for stowing SMBs, lights or other accessories.