Important message.

You will need a large doughnut ring with a 6" opening to use these reducer rings. If you have a Doughnut Chuck from Ron Brown's Best, LLC, you already have that ring. If you have a Longworth Chuck Type 2 Basic, don't order this set. Instead, order the "Upgrade Package for the Longworth Chuck Type 2 Basic"

Openings included in this set are 5, 4, 3.5, &3"

ADD SOLID RING SET FOR DOUGHNUT CHUCKS, WITH THIS YOU CAN DO MORE AND GET MORE DONE. GET THE SHAPE YOU NEED TO MAKE THAT HOLD REALLY TIGHT.