This R5 (3/16”) cutting die, designed to cut up to 3” of stock at a time, is compatible with the CornerMaster 7 Corner Rounder. Ideal for trimming the sharp corners on paper and plastic covers, postcards, business cards, and more, this cutting die can be used to cut all standard materials such as paper, PVC, polyester, and other paper or plastic based products. Dies for the CornerMaster 7 are also available in 1/16”, 1/8”, 5/32”, 1/4", 9/32”, 5/16”, 3/8” and 7/16” radii - these interchangeable dies are quick and easy to switch out.