Deep Digger

Deep Digger (ディープディガー) is Uranus's special weapon from Mega Man V. This weapon can only be activated when Mega Man stands on top of certain square-shaped blocks, which he can pick up and throw forward in a straight line. Blocks that can be thrown will change color when Mega Man comes into contact with them. If a thrown block hits an object or wall, it will break into four smaller pieces that ricochet in the opposite direction. The floor of Terra's lair is made of Deep Digger blocks; accordingly, this weapon is his weakness. This can be used dig up blocks in Jupiter and Saturn's stage to obtain jewels.

Trivia
The Deep Digger can also be used against Uranus in boss refights to grab the ground pieces from under him thus making him falling into the pit,but it's hard to do because Mega Man can easily fall in as well and Uranus can regenerate the floor if you're not fast enough.