格	内经	外经	卷/米
US (inches)	(mm)	(mm)	(M/coil)
3/8"	12.3 - 12.8	18.5 - 19.0	50
1/2"	15.7 - 16.3	21.8 - 22.3	50
3/4"	20.7 - 21.2	26.2 - 27.7	30
1"	26.2 - 26.8	33.8 - 34.4	30
1-1/4"	34.7 - 35.4	42.4 - 43.2	20
1-1/2"	40.0 - 40.6	48.4 - 49.3	20
2"	51.3 - 51.9	60.4 - 61.3	15
2-1/2"	62.9 - 63.6	73.1 - 74.0	10
3"	77.9 - 78.7	88.9 - 89.9	10
4"	101.6 - 102.6	114.3 - 115.3	5