Image Item No. Description  57908  Technic, Brick Modified 2 x 2 with 2 Ball Joints Catalog: Parts: Technic, Brick  57909  Technic, Brick Modified 2 x 2 with Ball Joint and Axle Hole Catalog: Parts: Technic, Brick -  57910u  Technic, Brick Modified 2 x 2 with Ball Socket and Axle Hole (Undetermined Type) X Catalog: Parts: Technic, Brick  57910  Technic, Brick Modified 2 x 2 with Ball Socket and Axle Hole - Angled Forks with Round Ends and Open Sides Catalog: Parts: Technic, Brick