GAUGES TO MILLIMETRES
20ga	18ga	16ga	14ga	12ga	10ga
0.813 mm	1.024 mm	1.290 mm	1.629 mm	2.052 mm	2.588 mm
8ga	6ga	4ga	2ga	0ga	00ga
3.264 mm	4.111 mm	5.189 mm	6.543 mm	8.230 mm	9.246 mm
INCHES TO MILLIMETRES
1/4"	5/16"	3/8"	7/16"	1/2"	9/16"
6.35 mm	7.94 mm	9.53 mm	11.11 mm	12.70 mm	14.29 mm
5/8"	11/16"	3/4"	13/16"	7/8"	15/16"
15.88 mm	17.46 mm	19.05 mm	20.64 mm	22.23 mm	23.81 mm