This 1-foot-long black metal rod can defy gravity, supporting weight and resisting manipulation.
Wondrous Item 13,000 gp
Power (Minor Action)
Place the immovable shaft into position. It remains in that spot even if such placement defies gravity. You can reposition the immovable shaft using another minor action, but any other creature seeking to move it must succeed on a DC 25 Strength check and spend a standard action to move it 1 square.
Published in Adventurer's Vault, page(s) 173.