diff --git a/FlatCAMApp.py b/FlatCAMApp.py
index 872a6e4f..6c0701b0 100644
--- a/FlatCAMApp.py
+++ b/FlatCAMApp.py
@@ -231,6 +231,7 @@ class App(QtCore.QObject):
             "excellon_feedrate": self.defaults_form.excellon_group.feedrate_entry,
             "excellon_spindlespeed": self.defaults_form.excellon_group.spindlespeed_entry,
             "excellon_toolchangez": self.defaults_form.excellon_group.toolchangez_entry,
+            "excellon_tooldia": self.defaults_form.excellon_group.tooldia_entry,
             "geometry_plot": self.defaults_form.geometry_group.plot_cb,
             "geometry_cutz": self.defaults_form.geometry_group.cutz_entry,
             "geometry_travelz": self.defaults_form.geometry_group.travelz_entry,
@@ -360,6 +361,7 @@ class App(QtCore.QObject):
             "excellon_feedrate": self.options_form.excellon_group.feedrate_entry,
             "excellon_spindlespeed": self.options_form.excellon_group.spindlespeed_entry,
             "excellon_toolchangez": self.options_form.excellon_group.toolchangez_entry,
+            "excellon_tooldia": self.options_form.excellon_group.tooldia_entry,
             "geometry_plot": self.options_form.geometry_group.plot_cb,
             "geometry_cutz": self.options_form.geometry_group.cutz_entry,
             "geometry_travelz": self.options_form.geometry_group.travelz_entry,
diff --git a/FlatCAMGUI.py b/FlatCAMGUI.py
index 3c01d124..2ec95ac3 100644
--- a/FlatCAMGUI.py
+++ b/FlatCAMGUI.py
@@ -607,6 +607,23 @@ class ExcellonOptionsGroupUI(OptionsGroupUI):
         self.spindlespeed_entry = IntEntry(allow_empty=True)
         grid1.addWidget(self.spindlespeed_entry, 4, 1)
 
+        #### Milling Holes ####
+        self.mill_hole_label = QtGui.QLabel('<b>Mill Holes</b>')
+        self.mill_hole_label.setToolTip(
+            "Create Geometry for milling holes."
+        )
+        self.layout.addWidget(self.mill_hole_label)
+
+        grid1 = QtGui.QGridLayout()
+        self.layout.addLayout(grid1)
+        tdlabel = QtGui.QLabel('Tool dia:')
+        tdlabel.setToolTip(
+            "Diameter of the cutting tool."
+        )
+        grid1.addWidget(tdlabel, 0, 0)
+        self.tooldia_entry = LengthEntry()
+        grid1.addWidget(self.tooldia_entry, 0, 1)
+
 
 class GeometryOptionsGroupUI(OptionsGroupUI):
     def __init__(self, parent=None):