Rolled rim with tooth washer securely holds fabric in place. Made of corrosion-resistant brass. Nickel finish is brighter than the matte nickel finish. All Grommet sets are complete with 1 washer & 1 grommet (1 front & 1 back). #6 has 3/4” Inside Diameter (ID), #8 has 1 1/8” ID and #10 has 1 7/16” ID. 23 Gromnets in set