Brick Sloped Inverted 34° 3 x 1 with Internal Stopper
Part Number 4287b
Name Brick Sloped Inverted 34° 3 x 1 with Internal Stopper
Category Bricks Sloped
Material Plastic
2 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 403 sets
Dark Bluish Gray (109 sets)
    Light Bluish Gray (89 sets)
      White (83 sets)
        Black (51 sets)
          Reddish Brown (43 sets)
            Red (39 sets)
              Blue (18 sets)
                Yellow (16 sets)
                  Dark Green (13 sets)
                    Bright Light Orange (4 sets)
                      Green (3 sets)
                        Sand Blue (3 sets)
                          Dark Red (2 sets)
                            Dark Gray (1 set)
                              Dark Purple (1 set)
                                Maersk Blue (1 set)
                                  Pastel Blue (1 set)