Image Item No. Description  30237b  Brick, Modified 1 x 2 with Open O Clip Thick (Vertical Grip) Catalog: Parts: Brick, Modified  52107  Brick, Modified 1 x 2 with Studs on 2 Sides Catalog: Parts: Brick, Modified  52038  Brick, Modified 2 x 4 - 1 x 4 with 2 Recessed Studs and Thick Side Arches Catalog: Parts: Brick, Modified