RELL Engineering Development Unit (left) pictured alongside RiTS. (Credits: NASA)

A protective storage unit for robotic tools called Robotic Tool Stowage (RiTS) was among the items launched to the International Space Station last December as part of SpaceX’s resupply services mission for NASA.

After it was prepared on station, RiTS – loaded with two Robotic External Leak Locator (RELL) units – was sent outside with the spacewalking astronauts who attached it to the station’s mobile platform.