Abstract: For constructing walls of building blocks and the like a device is provided that can be clamped down upon a corner block by turning a hand crank at the top of a long rod that extends above the top of the wall. Slide grips for a running line are provided that fit vertical flanges on the device.

Abstract: A level-indicating device comprises nail-guiding means for tacking the level onto a door or other wooden structure.

Abstract: For leveling prehung door assemblies a device is described on which a level indicator is mounted on one flange of a channel member that can be snap fitted onto the door edge.

Abstract: An elongated body is provided for use as a threshold and is transversely stepped whereby the body includes high and low opposite side longitudinally extending upper surfaces. The body includes a central upstanding surface extending between the high and low upper surfaces with the latter extending transversely of the body in opposite directions from the upper and lower margins of the upstanding surface. The portion of the low upper surface adjacent the lower margin of the upstanding surface is transversely downwardly inclined theretoward and the body includes transverse inclined passages formed therein with the upper ends of the passages opening through the upright surface lower margin and the lower ends of the passages opening outwardly of the longitudinal marginal portion of the body away from which the upstanding surface faces.