Image Item No. Description By  88292  Arch 1 x 3 x 2 Catalog: Parts: Arch 2  3659  Arch 1 x 4 Catalog: Parts: Arch 3  3307  Arch 1 x 6 x 2 - Thick Top with Reinforced Underside Catalog: Parts: Arch 1  6060  Arch 1 x 6 x 3 1/3 Curved Top Catalog: Parts: Arch 1