The Lassco Wizer CR-20 Tabletop Corner Rounder is a convenient, economical corner cutter. It has a sturdy aluminum construction an unbreakable plastic top-plate. The CR-20 has interchangeable corner rounding dies that come in sizes 1/8", 1/4", 3/8", or 1/2". When purchsasing the CR20 corner rounding machine you are able to choose one corner cutting unit to be included with your order.