Parallels and sets are used for various positioning and layout tasks like providing a flat and parallel base that is used to elevate workpieces that are otherwise too small to fit in a vise. Adjustable parallel pairs and steel parallel pairs and sets are rectangular blocks with parallel and square dimensions that hold workpieces in a vise to allow clearance for cutting tools. Granite straight edges, parallels, and tri-squares are solid tools used for layout and positioning. Planer gauges, also known as shaper gauges, are triangular tools that set shaper and planer tools.