#2 Stainless Steel *Rolled Rim Spur Grommets Grommet hole size after setting is 3/8" Inch. Stainless steel grommets require more force to set than regular grommets. * Stainless Steel Grommets are different from regular grommets. Even though these grommets are "Rolled Rim Spur" by classification you will need the #2 Plain Grommet setting tool for correct installation.