6mm = almost 1/4 inch. 7mm = almost 9/32 inch (= a bit over 1/4 inch) 8mm = 5/16 inch.
Simply so, is 8mm half inch?
5/16 Inch
MM | Approximate Size In Inches | Exact Size In Inches |
---|---|---|
6mm | Just short of 1/4 Inch | 0.23622 Inches |
7mm | Little over 1/4 Inch | 0.27559 Inches |
8mm | 5/16 Inch | 0.31496 Inches |
9mm | Just short of 3/8 Inch | 0.35433 Inches |