Sledge Bros. (or Sledge Brothers) are large overweight versions of Hammer Bros. that throw sledge hammers instead of regular ones. They can create small earthquakes as well.
They are subspecies of Hammer Bros. They throw large sledge hammers instead of normal hammers and they can create small earthquakes by jumping which can stun the player.
Super Mario Bros. 3
In Super Mario Bros. 3, Sledge Bros. can create small earthquakes to disorientate Mario; it stops Mario/Luigi from moving, allowing it to continue to throw its hammers in succession. Mario/Luigi must jump as soon as it hits the ground(after it jumps) to maintain posture. Encountered first on World 5-Giant Land.
New Super Mario Bros. Wii
New Super Mario Bros. 2
New Super Mario Bros. U
Mario Party 10
A Sledge Bro can be fought as a boss in Party mode of Mario Party 10. One may also be holding the star at the end of Bowser Party if the four players make it to the end of a board.
Super Mario Maker
Sledge Bros appears as one of many enemies that can be added in stages of Super Mario Maker. However, they do not appear on the enemy tab itself. Instead, the player must give a Hammer Bro a Super Mushroom in order to turn it into a Sledge Bro.