Image Item No. Description  41531  Cylinder 4 x 4 x 1 2/3 with Pin Holes and Center Bar Catalog: Parts: Cylinder  44359  Cylinder Hemisphere 3 x 3 Ball Turret Catalog: Parts: Cylinder  44358  Cylinder Hemisphere 3 x 3 Ball Turret Socket with 2 x 2 Base Catalog: Parts: Cylinder