... .8.. Non Standard Bolts,Non Standard Hardware,USA Bolts And Nuts.1.What’s the specification of our Products ? MaterialsCarbon steel ... strong not break when you tighten the fasteners by wrench ,key ,bit and spanner.When head become thicker,and then the ... ,it is convenient to tighten the fasteners by wrench,,bit,key etc.3.The scrows are also much deeper than some ...