Abstract: A cutting device comprises a holder body having a handle and a rabbet edge guide. The rabbet edge guide is disposed along one edge of the handle body and comprises a rabbet with an extending rear face. Adjacent the rabbet on the front face of the holder body is a blade holder mechanism comprising a V-shaped indentation in the holder body and a securing mechanism for a blade. In use, a blade is secured to the blade holder mechanism so that a cutting edge of the blade extends beyond the holder body and into the rabbet, parallel to the extending rear face. A rabbet cut is made in a ceiling tile by pressing the rear face of the holder body against the edge of the tile to be cut, and running the blade along the tile, to create a straight cut that penetrates only a portion of the depth of the tile. The tile is then rotated 90 degrees, and another cut is made into the edge of the tile, with the rear face of the holder body resting against one of the faces of the tile.

Abstract: A security post for automobiles vertically disposed in the ground to allow or prevent access to a particular area. The post is manually withdrawn form the ground and secured in place with a securing bolt and lock. Guides on the post provide and easily slidable member within a sleeve that is disposed in the ground. A cover is provided for preventing the accumulation of dirt or other foreign particles on the top of the post and sleeve.