... years experience 1,Name: Steel hex coupling;steel coupling;hex coupling2,For the similar coupling ,what can we do ?(1), ... Ability for the material of this kind of coupling : Grade3.6,4.6,4.8,5.6,6 ... the delivery?(1),Delivery port:ShangHai/NingBo(2),Delivery way to avoid the anti-dumping5,Why should you choose ... built for about 20 years,we have our own way to supply you the high quality products with ...