PFSRD:Mallet of Building
From D&D Wiki
|This material is published under the OGL 1.0a.|
Price 5,000 gp; Aura moderate conjuration; CL 9th; Weight 2 lbs.
This heavy builder's mallet has a wooden shaft and a head made from shiny black iron that turns slightly red when held close to metal. The wielder of the mallet can, as a full-round action, swing the hammer to create and immediately hammer into place a copper nail, iron spike, iron piton, or 4-foot wooden fence post. A created fence post can penetrate earth, and the other materials can penetrate earth, wood, or stone. Removing the created item from the surface destroys it, but otherwise the item lasts as long as a normal object of its sort. The mallet can create up to 100 items per day.
Cost 2,500 gp