Image Item No. Description By  47431  Technic, Brick Modified 2 x 2 with Axle Hole, Rotation Joint Ball Half Vertical, and Fist Catalog: Parts: Technic, Brick 126  48170  Technic, Brick Modified 2 x 2 with Pin Hole and Rotation Joint Ball Half Horizontal Catalog: Parts: Technic, Brick 18103  48171  Technic, Brick Modified 2 x 2 with Pin Hole and Rotation Joint Ball Half Vertical Catalog: Parts: Technic, Brick 28211  48169  Technic, Brick Modified 2 x 2 with Pin Hole and Rotation Joint Socket Catalog: Parts: Technic, Brick 34420  47452  Technic, Brick Modified 2 x 2 with Pin Hole, Rotation Joint Ball Half Horizontal, and Rotation Joint Socket Catalog: Parts: Technic, Brick 2997  47454  Technic, Brick Modified 2 x 3 with Pin Holes, Rotation Joint Ball Half Horizontal, and Rotation Joint Socket Catalog: Parts: Technic, Brick 918  47432  Technic, Brick Modified 2 x 3 with Pin Holes, Rotation Joint Ball Half Vertical, and Rotation Joint Socket Catalog: Parts: Technic, Brick 1677