Trend M/PB01 Perfect Butt Scribing Tool Quick and easy to use by remaining stable whilst scribing directly onto work-surfaces, flooring, shelves etc. Works by running a wheeled scribe unit along an irregular feature. The sprung pencil in its center will accurately copy the profile directly onto the work-piece to be installed. It can then be cut and fitted to the surface resulting in a perfect butt 5 sizes of quick fit track wheels to cope with a variety of situations