Measuring tool to instantly locate positioned for dowels, screws, biscuits, pins and drilling holes. Designed for both left and right handed use. Can be used to layout buttons on a shirt, pleats in curtains, columns on a list, small pictures on a wall, shelves in a cupboard. Must not be used for small high tolerance joints i.e. dovetails and finger joints due to float in mechanisms. specification:. Width range of 75mm (3ó) to 610mm (24ó). Eight stainless steel upright indicators.