This set of five Atomos Master Caddy III units is compatible with the Shogun and Ninja V series monitors, and it is required if you are using the Atomos CONNECT accessory. The Master Caddy III supports standard 2.5" SSDs and HDDs, and the drive mounts into the caddy using four screws. The Master Caddy III is slimmer and lighter than its predecessor, the Master Caddy II. When utilizing the Atomos CONNECT with your monitor, this model is required as the Master Caddy II model is not compatible with the CONNECT.