Image Item No. Description  4733  Brick, Modified 1 x 1 with Studs on 4 Sides Catalog: Parts: Brick, Modified  4595  Brick, Modified 1 x 2 x 2/3 with Studs on Sides and Extended Stud Receptacle Catalog: Parts: Brick, Modified  4730  Brick, Modified 2 x 2 with Pin and No Axle Hole Catalog: Parts: Brick, Modified  4748  Brick, Modified 2 x 4 with Coupling, Female Catalog: Parts: Brick, Modified  4747  Brick, Modified 2 x 4 with Coupling, Male Catalog: Parts: Brick, Modified