titanium screw for bicycle Grade:Gr2 The specificationwould be changed by the customers' require titanium screw for bicycleGrade:Gr1,Gr2,Gr3,Gr5,Gr7,Gr9 ... 965,DIN966,ISO7380,DIN555,DIN934,DIN985,DIN9623,DIN125,DIN127,DIN69235)Grade:Gr1,Gr2,Gr3,Gr5,Gr7,Gr9,Gr12,Gr23 titanium screw ...