The first spacewalk of 2018, U.S. EVA-47, is now in the history books after two NASA astronauts completed a nearly 7.5 hour extravehicular activity to replace an aging latching end effector on the International Space Station’s robotic Canadarm2.

Canadarm2 has a latching end effector, also called a LEE, on either side of the 17-meter robotic arm to either grab onto the exterior of the station, move objects around the outpost, or grab visiting spacecraft.