http://tinyurl.com/qa9f8oa
NT Cutter 45 degree bevel Oval and Circle Mat Board Cutter, 1 Cutter (OL-7000GP)
Mat board cutter
45 degree bevel circle or oval cut
Circle: Dia. 20-36cm (7.874-14.173")
Oval: Dia. 17-21cm~38-42cm (6.69-8.27"~14.96-16.54")
# of blade included: 2