These sets are excellent for eliminating the panel rattle that may come up with the standards cabinet sets. Cut precise grooves into your plywood veneered panels and make perfect rattle-free fit. Groove adjustment from 13/64″ to 17/32″. For use on table-mounted routers only. Two styles to choose from. Both sets are 1-5/8″ Dia, 1/2″ Shank.