diff --git a/data/tetra/materials/metal/hepatizon.json b/data/tetra/materials/metal/hepatizon.json
index 91ce553..865194d 100644
--- a/data/tetra/materials/metal/hepatizon.json
+++ b/data/tetra/materials/metal/hepatizon.json
@@ -24,6 +24,6 @@
         "items": [ "tconstruct:hepatizon_ingot" ]
     },
     "requiredTools": {
-        "hammer_dig": 5
+        "hammer_dig": 4
     }
 }
diff --git a/data/tetra/materials/metal/manyullyn.json b/data/tetra/materials/metal/manyullyn.json
index 816d54b..d44fa46 100644
--- a/data/tetra/materials/metal/manyullyn.json
+++ b/data/tetra/materials/metal/manyullyn.json
@@ -24,6 +24,6 @@
         "items": [ "tconstruct:manyullyn_ingot" ]
     },
     "requiredTools": {
-        "hammer_dig": 5
+        "hammer_dig": 4
     }
 }
diff --git a/data/tetra/materials/metal/queens_slime.json b/data/tetra/materials/metal/queens_slime.json
index b9080c6..95e7b57 100644
--- a/data/tetra/materials/metal/queens_slime.json
+++ b/data/tetra/materials/metal/queens_slime.json
@@ -24,6 +24,6 @@
         "items": [ "tconstruct:queens_slime_ingot" ]
     },
     "requiredTools": {
-        "hammer_dig": 5
+        "hammer_dig": 4
     }
 }
diff --git a/data/tetra/materials/metal/slimesteel.json b/data/tetra/materials/metal/slimesteel.json
index 961357b..22f16f8 100644
--- a/data/tetra/materials/metal/slimesteel.json
+++ b/data/tetra/materials/metal/slimesteel.json
@@ -41,6 +41,6 @@
         "items": [ "tconstruct:slimesteel_ingot" ]
     },
     "requiredTools": {
-        "hammer_dig": "minecraft:iron"
+        "hammer_dig": 3
     }
 }
diff --git a/data/tetra/materials/metal/steel.json b/data/tetra/materials/metal/steel.json
index eb35ac5..9ce3a74 100644
--- a/data/tetra/materials/metal/steel.json
+++ b/data/tetra/materials/metal/steel.json
@@ -24,6 +24,6 @@
         "items": [ "tconstruct:steel_ingot" ]
     },
     "requiredTools": {
-        "hammer_dig": 4
+        "hammer_dig": 3
     }
 }