BS4-2 button sewer ,it is suitable for the factory of grament , underwear ,kintting to sew the buttons. BS4-2 button ... sewer ,it is suitable for the factory of grament , underwear ,kintting to sew the buttons.ZN-90 binding ... . Its features: faster ,efficacy ,high, appearance of the ride nail rivet via the buckle flipping rivet uniform, rivet firm .This preparation based on customer ...