Image Item No. Description By  57909  Technic, Brick Modified 2 x 2 with Ball Joint and Axle Hole Catalog: Parts: Technic, Brick 13  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 1