Measure, mark, and install trim quickly and easily. Get consistent casement reveals for a professional look every time. Built-in tape measure hook slots and preset reveal allows accurate measuring of all trim pieces at 1 time. Accurately transfers the measurements to trim stock and mark cut lines. Holds the trim pieces in perfect alignment while they're nailed in place. Starter nail guide helps prevent costly splits and wasted material. Ergonomic design is easy-to-use and durable.