diff --git a/src/main/java/kasuga/lib/registrations/common/BlockReg.java b/src/main/java/kasuga/lib/registrations/common/BlockReg.java
index 77987f6f..937577ee 100644
--- a/src/main/java/kasuga/lib/registrations/common/BlockReg.java
+++ b/src/main/java/kasuga/lib/registrations/common/BlockReg.java
@@ -31,6 +31,7 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.function.BiFunction;
 import java.util.function.Supplier;
 
 
@@ -287,6 +288,13 @@ public <R extends Item> BlockReg<T> withItem(ItemReg.ItemBuilder<R> builder, Res
         return this;
     }
 
+    @Optional
+    public <R extends Item> BlockReg<T> withItem(BiFunction<T, Item.Properties, R> builder, ResourceLocation itemModelLocation) {
+        itemReg = new ItemReg<R>(registrationKey, itemModelLocation);
+        itemReg.itemType((p)->builder.apply(this.registryObject.get(),p));
+        return this;
+    }
+
     /**
      * Is your item renderer by your custom renderer? If you want to create a custom rendered item, see
      * {@link kasuga.lib.core.base.CustomRenderedItem}