Abstract: A tool is provided for relative positioning of a first board and a second board such that the first and second boards can be secured to each other. The tool comprises a base portion including a pair of locking pliers, and grabbing portions respectively secured to jaws of the locking pliers. The grabbing portions are configured to receive the first board therebetween when the grabbing portions are brought toward each other by operation of the pliers. The grabbing portions further have parts disposed to abut a thickness surface of the received first board and projections disposed to embed into opposite side surfaces of the received first board. At least one of the grabbing portions has a forwardly projecting member disposed to be abutted with the second board to position adjacent edges of the received first board and the second board substantially flush with each other.