Abstract: A tool for supporting a rain gutter during its installation on a fascia board. The tool has a height-adjustable bracket and locking pliers with jaws having wide, flat working faces. Once several such tools are temporarily locked onto the lower edge of the fascia board, not only can they be used to support an elongated gutter but also each of the tools can be moved vertically without disturbing the pliers clamping it to the board, thereby making these tools especially handy for setting the height and slope of the gutter. For holding the adjustable bracket in position, each tool includes a mounting block which is rigidly attached to the back of a fixed jaw of the locking pliers and defines a pair of holes which extend parallel to the plane of the working face of the fixed jaw. The bracket is formed from an elongated rod bent to form an angular structure which terminates in a pair of parallel branches slideably insertable into the holes formed in the block.