Image Item No. Description  48171  Technic, Brick Modified 2 x 2 with Pin Hole and Rotation Joint Ball Half Vertical Catalog: Parts: Technic, Brick  47452  Technic, Brick Modified 2 x 2 with Pin Hole, Rotation Joint Ball Half Horizontal, and Rotation Joint Socket Catalog: Parts: Technic, Brick  47454  Technic, Brick Modified 2 x 3 with Pin Holes, Rotation Joint Ball Half Horizontal, and Rotation Joint Socket Catalog: Parts: Technic, Brick