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双线圈

双线圈优点:能平翻至180度,便于翻阅;能够360度翻揭;跨页图文能够对称拼合;

齿距

pitch

型号

size

内直经

coil diameter

建议最大装订厚度recommended

maximum book thickness

3:1

1/4”

6.4mm

4.8mm

5/16”

7.9mm

6.4mm

3/8”

9.5mm

7.9mm

7/16”

11.1mm

9.5mm

1/2”

12.7mm

11.1mm

9/16”

14.3mm

12.7mm

2:1

5/8”

16.0mm

14.3mm

3/4”

19.0mm

17.5mm

7/8”

22.0mm

20.6mm

1”

25.4mm

23.8mm