Is there a reason for the notches on the blades?


In Attack on Titan, the blades used with the 3D Manuever Gear have notches in
them similar to those found on craft knives:

![enter image description here](https://i.stack.imgur.com/mxDxb.png)

![enter image description here](https://i.stack.imgur.com/FMjJp.png)

Certain knives like the one above come with snap-off points so that when the
blade dulls, it can be removed and replaced by a fresh and sharp piece.
However, a utility like this seems redundant on the 3DMG blades as a shortened
blade would be extremely ineffective at removing a Titan's neck, not to
mention that the blades seem to be used and discarded as a whole piece.  
Additionally, [The wiki page on the blades
themselves](http://shingekinokyojin.wikia.com/wiki/Super_Hardened_Steel) gives
no mention of the notches.

So is there any reason for the notches to exist aside from looking cool?




The blades were very prone to breakage [picture needed]. The vertical maneuver
gear has even a spare blade storage built-in [picture needed], and on at least
one occasion one soldier was left without blades [chapter ref needed] and a
companion had to share blades with him.

The notches make sense since the blades break so often that even a short and
less effective blade had a chance of scoring a kill and you could make the
most out of a blade before it becomes completely useless.

Also, the resources inside the walls are scarce. Making the most out of the
metal available also made sense.

* * *

* _I have no access to Crunchyroll manga at the moment, and cannot search for manga images._

