Kiribachi

The Kiribachi is a gigantic sword used by Arlong. It has saw-toothed patterned blades, resembling a shark's saw-like teeth. This sword was not Arlong's main weapon of choice, but merely as a final resort against powerful opponents. Several of its blades were broken by Monkey D. Luffy.

Abilities
The sheer size of the sword is quite enough to overwhelm an ordinary opponent. Also, the multiple blades means one or two broken teeth won't render the sword completely useless.

Arlong has shown to swing the Kiribachi in a frenzied manner, including like a massive buzzsaw.