... 20 years experience in special fastener field 1,Name:Seel special fastener;Steel fastener;Special fastener 2,For the similar fastener,what can we do ... ?(1), Ability for the material of this kind of fastener: Grade3.6,4.6,4.8,5.6,6.8 ... .P.S:For us,the most competitive industry is machined hardware fastener ,especially the cutting/turning parts. Steel special ...