High quality double wire(O-wire,twin ring loop) is used in book & calendar binding. 
 
| Size of Double Looped Coil (Package) | 
| Pitch | 
Model | 
Circle Drive(mm) | 
Binding Thickness(mm) | 
Packing Quantity (toothed / box) | 
Diameter(mm) | 
| P3:1 | 
3/16" | 
4.8 | 
3 | 
118000 | 
0.7 | 
| P3:1 | 
1/4" | 
6.4 | 
4 | 
84000 | 
0.7 | 
| P3:1 | 
5/16" | 
7.9 | 
5.6 | 
60000 | 
0.8 | 
| P3:1 | 
3/8" | 
9.5 | 
7 | 
43000 | 
0.8 | 
| P3:1 | 
7/16" | 
11.1 | 
9.5 | 
32000 | 
0.9 | 
| P3:1 | 
1/2" | 
12.7 | 
11.1 | 
26000 | 
0.9 | 
| P3:1 | 
9/16" | 
14.3 | 
12.7 | 
19300 | 
1 | 
|        | 
| P2:1 | 
1/4" | 
6.4 | 
4 | 
56000 | 
0.7 | 
| P2:1 | 
5/16" | 
7.9 | 
5.6 | 
40000 | 
0.8 | 
| P2:1 | 
3/8" | 
9.5 | 
7 | 
29500 | 
0.8 | 
| P2:1 | 
7/16" | 
11.1 | 
9.5 | 
21000 | 
0.9 | 
| P2:1 | 
1/2" | 
12.7 | 
11.1 | 
17500 | 
0.9 | 
| P2:1 | 
9/16" | 
14.3 | 
12.7 | 
13000 | 
1 | 
|        | 
| P2:1 | 
5/8" | 
15.9 | 
13.2 | 
10500 | 
1.1 | 
| P2:1 | 
3/4" | 
19 | 
15 | 
7000 | 
1.2 | 
| P2:1 | 
7/8" | 
22.2 | 
19 | 
5000 | 
1.2 | 
| P2:1 | 
1" | 
25.4 | 
21 | 
4500 | 
1.25 | 
| P2:1 | 
1-1/8" | 
28.6 | 
25.4 | 
3400 | 
1.5 | 
| P2:1 | 
1-1/4" | 
31.8 | 
28.6 | 
2250 | 
1.5 | 
| 
P2:1 | 
1-1/2" | 
38.1 | 
32.1 | 
Cut packaging | 
1.5 |