Image Item No. Description By  3700  Technic, Brick 1 x 2 with Hole Catalog: Parts: Technic, Brick 2  57909  Technic, Brick Modified 2 x 2 with Ball Joint and Axle Hole Catalog: Parts: Technic, Brick 1  48170  Technic, Brick Modified 2 x 2 with Pin Hole and Rotation Joint Ball Half Horizontal Catalog: Parts: Technic, Brick 1  48169  Technic, Brick Modified 2 x 2 with Pin Hole and Rotation Joint Socket Catalog: Parts: Technic, Brick 1