An essential tool! This versatile and effective mount cutter is easy to use, fast and portable, it cuts ovals and circles using a patented 3-step mechanism for gradual increase of blade depth. Converts from oval to circle cutter at the turn of an adjustable screw. Can cut single, double or even triple mounts with ease. Cuts ovals from 3.25" (82mm) to 4.75" (120mm) up to 20" (510mm) x 23" (596mm). Circles with a diameter from 4.5" (114mm) to 20" (510mm). Scale is marked in both Metric and Imperial Excellent value for money