This huge mallet is 8-ft long and weighs over 150 pounds. 

Any giant-sized creature with Strength of 21 or greater can employ it to drive piles of up to 2-ft diameter into normal earth at 4 per blow—2 blows per round. 

The maul will smash to flinders an oaken door of up to 10-ft height by 4-ft width by 2 inch thickness in 1 blow—2 if the door is heavily bound with iron. 

If used as a weapon it is +2 "to hit" and inflicts 10-40 hit points of damage, exclusive of Strength bonuses.