Brick 2 x 4 without Cross Supports
Part Number 3001a
Name Brick 2 x 4 without Cross Supports
Category Bricks
Material Plastic
8 related parts (same mold or print family)

Variants of a mold are catalogued separately, so each one has its own sets and minifigs. Check these too if something you expect is missing here.

Appears in 447 sets
Red (221 sets)
    White (170 sets)
      Blue (167 sets)
        Yellow (156 sets)
          Black (155 sets)
            Trans-Clear (113 sets)
              Light Gray (2 sets)
                Maersk Blue (1 set)