根据牙齿的宽度来判断:
一、metal zipper 金属拉链
3# 4.45mm
4# 4.90mm
5# 5.80mm
7# 6.50mm
8# 7.80mm
10# 9.20mm
二、Nylon zipper 尼龙拉链
3# 4.15mm
4# 4.90mm
5# 6.00mm
7# 6.45mm
8# 7.10mm
三、Derlin zipper树脂拉链
3# 4.65mm
5# 5.75mm
8# 7.70mm
10# 8.70mm