1 we can provide free samples to the client , the client only needs to pay the shipping charges .2 As a professional factory in Electrical Tro and Bicyle parts of more than 15 years , we can providemore professional products and services .3 we have a lot of professional cold forging machine , in this way can ensurethe quality is much better . 4 us a lot of series products and R & D can produce as client design too .