Abstract: A device for holding and cutting a thin plate of sheet material such as glass or plastic into a plurality of smaller rectangular plates with a hand-manipulated tool. A rigid base is formed with a recess which forms a depressed platform for receiving and firmly holding a plate therein. A pair of spaced posts are mounted on the base and are located at opposite sides from each other. A template is removably mounted on the base by the posts which extend into a selected pair of a plurality of holes formed in the template. A plurality of spaced, linearly extending grooves are formed in the template for guiding a cutting tool in a straight line when cutting the plate which is mounted between the base and template. The template is rotated 90.degree.