... , Bronze, Carton steel,Stainless steel, etc certification: ISO9001:2008 name: Butterfly bolt Material: Brass, Bronze, Carton steel(low/medium/high carbon ... , Certificates: ISO 9001:2008 WE CAN products are bolts, screws, nuts, machine screws, plain washers, spring lock washers, wood screws, tapping ... our factory. we can product this machine as customers' requirements. Butterfly bolt