3-step mechanism is fast, portable, very easy to use, and costs hundreds less than comparable oval cutters. Cuts perfect bevel openings without connecting to any other equipment. Cut single, double, or even triple mats. Adjusts from oval to circle cutter with a simple twist of the knob. Cut ovals from 3-1/4″ x 4-3/4″ (8.25cm x 12cm) to 20″x 23″ (51cm x 58cm) and circles from 4-3/4″ to 20″ (11.5cm x 51cm) diameter. Maximum difference between oval width and oval height is 3″ (7.62cm). Includes creative matting instructions and five extra blades. Uses Logan 324 blade.