You must use Cruiser plain die. The main factor in choosing a line of grommets relates to the dies that you may already have., Based on a European Metric sizing system - sizes are very close to the standard system normally used. Do not have a protective rolled rim on the grommet. Due to the differences in construction, there may be a slight difference in the finished hole size between spur and plain grommets. Will not work with Osborne Brand Dies, must be used with Cruiser Brand Dies.
Home Decor Essentials Binder , Supply Catalogue 5th Ed
3/8" (Inside Diameter)
To be used with Cruiser dies. Use die part number 6145, and also use hole punch part number 5031.