For use with the Rockler Shutter System. Use these router bits to create your own shutter louvers in 2-1/2" or 3-1/2" widths. 1/2" shank.Ready to build your own custom shutters with ease? View all of our Rockler Shutter Jig Templates and select the style that is perfect for your application! Technical Details:For use with Rockler's Shutter SystemUse to create your own shutter louvers in 2-1/2" or 3-1/2" widths1/2" shank?