Used to align deck / decking boards to prevent bows and make boards parallel.
http://www.cepcotool.com/bowrench.html
Product made especially for easily bending deck boards, eliminating crown and creating a flush space between boards. Just slip the BoWrench:registered: Gripper over the joist and slide the handle until it locks in place! The Bowrench:registered: frees up your hands while holding the board on its own!