diff --git a/src/lazyslide/_const.py b/src/lazyslide/_const.py
index be33452..8d0ff06 100644
--- a/src/lazyslide/_const.py
+++ b/src/lazyslide/_const.py
@@ -11,11 +11,6 @@ class Key:
     def tile_graph(cls, name):
         return f"{name}_graph"
 
-    @classmethod
-    def holes(cls, name=None):
-        name = name or cls.tissue
-        return f"{name}_holes"
-
     @classmethod
     def feature(cls, name, tile_key=None):
         tile_key = tile_key or cls.tiles