Screw Crusher

Screw Crusher (スクリュークラッシャー) is Punk's special weapon. It throws a saw that moves up for a while and then loops down. It is imperative in the battle against the Wily Machine's second form, as it is the only weapon that will harm it. It does considerable damage, and can be used several times as it doesn't use much energy. However only one can be on the screen at a time.

Screw Crusher can also be obtained in Mega Man 10, Mega Man being the only playable character able to use it. In this game Mega Man can have up to four onscreen at a time, and it is most effective against Ballade, Pump Man, Chill Man, and the Weapons Archive's data of Ring Man and Tornado Man. It can also be used to disarm some enemy shields when fired fast enough. 

Capacity
In Mega Man III and Mega Man 10, Mega Man can use eight Screw Crushers with only one weapon energy unit. With a full weapon energy gauge, it can be used 152 times in Mega Man III and 224 times in Mega Man 10.

Sprites
