... Wantong Electromechanical Manufacturing Co.,Ltd.1. established in 1988, 20 years experience, first manufacturer of bimetal rivet making machine in China ... .2. publisher of industry standard of bimetal rivet making machine,3. overwhelming bigger share in home market, 4. ... knives to cut the material YFC-30 Cold Heading Machine for Bimetal Contact Rivets, Bi-Metal Contact Rivet Manufacturing Machine