... not change,and the voice of fasten and pulling also clear. 3).Even the thickness of fitting cloth is different,use ... control ±0.01MM,it is good for automatic fitting machine. 5).It is easy to adjust the fitting machine, non professional ... ,15,17,18,20mm13.5mm13.3mm12.7mm 406#12.5,14,15,17,18,20mm10.6mm11.5mm11mm GH Button --- Spring Snap Button