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  48172  Technic, Brick Modified 2 x 2 with Pin Hole and 2 Rotation Joint Sockets Catalog: Parts: Technic, Brick