This huge digging tool is 10-ft long and weighs over 100 pounds. 

Any giant-sized creature with a Strength of 20 or more can use it to loosen (or tumble) earth (or earthen ramparts) in a 100 cubic foot area in 1 turn. It will smash rock in a 20 cubic feet area in the same amount of time. 

If used as a weapon, it is +3 "to hit" and does 5-30 hit points of damage, exclusive of Strength bonuses. (Cf. girdle of giant strength.)