Hub, NXT Brick with Dark Bluish Gray Base [Complete Assembly]

Reference

53788

Hub, NXT Brick with Dark Bluish Gray Base [Complete Assembly] (part 53788) is a LEGO element. CollectORbuild's catalog records it in 6 sets, including Intelligent NXT Brick (Black) and Mindstorms Education NXT Base Set. It has been produced in 2 different colors.