diff --git a/Hardware/Development/smooth_rod_fix/smooth_rod_fix.scad b/Hardware/Development/smooth_rod_fix/smooth_rod_fix.scad
index 890fe3c..91f7e3e 100644
--- a/Hardware/Development/smooth_rod_fix/smooth_rod_fix.scad
+++ b/Hardware/Development/smooth_rod_fix/smooth_rod_fix.scad
@@ -44,13 +44,13 @@ translate([0,0,part_z/2]) difference() {
 } // End of difference() command
 
   if(with_extra_parts) {
-    // --- Self tapping screw 2.9 x 13 mm ---
+    // --- Self tapping screw 2.9 x 16 mm ---
     color(Steel) {
       translate([0,0,-.2]) {
         translate([-smooth_rod_screw_sep,0,0])
-          csk_bolt(2.9, 13);
+          csk_bolt(2.9, 16);
         translate([smooth_rod_screw_sep,0,0])
-          csk_bolt(2.9, 13);
+          csk_bolt(2.9, 16);
       }
     }
   }