本公司的铁线圈，采用进口包胶钢线制成，外层尼龙色泽亮丽，极薄而匀称；中心钢材坚硬，历久不变形，无论外观及耐用性，均远胜一般包胶铁线。
Our metal spirals are made of imported nylon coated wire. The surface of the nylon coating is smooth and lustrous and the core wire rigid, offering far better durability and appearance than other types of nylon coated wire.
规格表Specifications:
|
线圈内直径
Coil Diameter
|
建议最大装订厚度 Recommended Maximum Book Thickness (mm)
|
齿距
Pitch
|
|
英寸 毫米
inch mm
|
毫米
mm
|
毫米
mm
|
|
1/4 6.4
|
3.4
|
6
|
|
5/16 7.9
|
4.9
|
6
|
|
3/8 9.5
|
6.5
|
6
|
|
7/16 11.1
|
8.1
|
6
|
|
1/2 12.7
|
9.7
|
6
|
|
9/16 14.3
|
11.3
|
6
|
|
5/8 15.9
|
12.9
|
6
|
|
3/4 19.1
|
15.1
|
6
|
|
7/8 22.2
|
18.2
|
6
|
|
1 25.4
|
20.4
|
6 or/或8
|
|
1-1/8 28.6
|
23.6
|
6 or/或8
|
|
1-1/4 31.8
|
25.8
|
6 or/或8
|
|
1-1/2 38.1
|
32.1
|
6 or/或8
|
|
1-5/8 41.2
|
35.2
|
6 or/或8
|
|
2 50.8
|
42.8
|
6 or/或8
|
