13/16 inch
In respect to this, how wide is 21 mm in inches?
| MM | Approximate Size In Inches | Exact Size In Inches |
|---|---|---|
| 20mm | Just short of 13/16 Inch | 0.78740 Inches |
| 21mm | Little over 13/16 Inch | 0.82677 Inches |
| 22mm | Just short of 7/8 Inch | 0.86614 Inches |
| 23mm | Little over 7/8 Inch | 0.90551 Inches |