For best results in setting our plain rim grommets and washers, use an Osborne No. 500 hole punch and an Osborne No. 216 setting die with corresponding sizes. Also can be set using W-1 Machines.
Material is brass with nickel finish.
| Osborne No. | Hole diameter when set (in) | Outside diameter (in) | Length under flange (in) | Weight per box (lbs) - (oz) |
| N1-00 | 3/16 | .460 | .135 | 0 - 2 |
| N1-0 | 1/4 | .546 | .175 | 0 - 5 |
| N1-1 | 9/32 | .7 | .185 | 0 - 8 |
| N1-2 | 3/8 | .835 | .215 | 0 - 12 |
| N1-3 | 7/16 | .955 | .295 | 1 - 2 |
| N1-4 | 1/2 | 1.062 | .374 | 1 - 8 |
| N1-5 | 5/8 | 1.205 | .330 | 1 - 12 |
