Cornerounder® die cutting units are compatible with Model 20 Standard and Model 50B Heavy Duty corner rounder machines. These dies offer a wide variety of corner radii. Sizes from 1/16" through 5/8" can cut up to a 1/2" of material. Sizes from 3/4" through 1-1/2" can cut up to an 1/8" of material. Like their machine counterparts, Cornerounder® dies are designed for cutting paper and plastic substrates. With hardened blades, these dies are constructed for long-term use.