In Justice League (2017) there's a scene in the Batcave in which Aquaman stole something.
What did he steal?
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We can see it here. It appears to be a black (what else?) Leatherman multitool
Since the film's not accessible to me at the moment, I have only my memory to offer you, but he stole a tool similar to a Leatherman Super Tool 300, based on photos and video available since the movie released officially on Digital format. It was taken from the table with assorted gear on it. He hefted it for a moment (evaluating its quality, I assume), and then kept it.