Image Item No. Description By  74188c01  Magnet Brick, Modified 2 x 4 Sealed Base with Extension Plate with 2 Studs and Hole Catalog: Parts: Magnet 1  388c01  Magnet Brick, Modified 4 x 4 Sealed Base Catalog: Parts: Magnet 8  2607  Magnet Holder 2 x 3 with Clips and Pin Hole Catalog: Parts: Magnet 1