C.S. Osborne Set of 12 Brass Grommets And Spur Washers. Brass material with brass finish grommets and washers. You will receive 12 grommets and 12 spur washers. Made in USA. Size : 2 Diameter of hole when set : 7/16" Set these grommets with one of the following tools: C.S. Osborne Plain Washer Grommet Setter, C.S. Osborne Grommet Kits or Press-N-Snap Tool. Punch holes before setting grommets with one of the following tools: C.S. Osborne Drive Hole Punch, C.S. Osborne Revolving Hole Punch or Screw Hole Punch.