Latin for "May these blades cut with strength and honor"?

I'm having an object engraved and I want to make sure I'm getting the idea across.

If each of these three lines were engraved would it make sense? Its for a male by the way if that matters. The object is a tobacco grinder with 19 little blades sticking out of the bottom of it.

- cancrivir - [The Crabman]

- celebrarem diem natalem XXV - [Celebrating 25 years of age]

- cultelli hi viribus honoreque concidant - [May these blades cut with strength and honor]
(The 'May' isn't necessarily important if its not in here so long as the main content (blades cut strength honor) is there).

Thanks in advance!