Image Item No. Description  92013  Technic, Brick Modified 2 x 2 with Ball Socket and Axle Hole - Straight Forks with Round Ends and Open Sides Catalog: Parts: Technic, Brick  48170  Technic, Brick Modified 2 x 2 with Pin Hole and Rotation Joint Ball Half Horizontal Catalog: Parts: Technic, Brick  48169  Technic, Brick Modified 2 x 2 with Pin Hole and Rotation Joint Socket Catalog: Parts: Technic, Brick