Designed for use with the CornerMaster 7 Corner Rounder, the R8 (5/16”) cutting die can handle up to 3” of stock at one time. It can be used to round the corners of all your paper and plastic covers, postcards, business cards, soft-cover books, catalogues, etc. The R8 cutting die can be used to cut all standard materials such as paper, PVC, polyester, and other paper or plastic based products. These cutting dies, which are quick and easy to switch out, are also available in 1/16”, 1/8”, 5/32” 3/16”, 1/4", 9/32”, 3/8” and 7/16” radii.