cold steel square steel bar S10C,S15C,S20C,S45C,SCM420,SCM440, cold drawn spring square steel A3/Q215/Q235/,S45C,S20C3X3,4X4,5X5,10X10,20X20,30X30,40X40,50X50,60X60,72X72,and the length is 5M-9M,if you want to buy this from us ,please contact me,thanks!best regards. square bar