1, Standard : ASTM F67 , ASTM F136 , GB/T 13810 ?DIN 933, DIN 912 , DIN 934 , DIN 7991 , GB/T 3908 , GB 5780 ~ 5782 , GB 5788 , GB 6178 ~ 61802, Material : G r 1 , G r 2 , G r 3 , G r 4 , G r 5 .3, Size : M 2 ~ M 22 .4, Screw Varieties : the first cylindrical titanium screw , titanium...