Technic Brick Special 2 x 2 with Axle Hole, Rotation Joint Ball Half [Vertical Side], Vertical Axle Hole End

Reference

47431

Technic Brick Special 2 x 2 with Axle Hole, Rotation Joint Ball Half [Vertical Side], Vertical Axle Hole End (part 47431) is a LEGO element. CollectORbuild's catalog records it in 30 sets, including Build-A-Bob and Danju (European version without Cards). It has been produced in 14 different colors.