Our factory produces 3-10 inch connecting rod, the material is 40CR, the rod diameter is 16MM, the marble is 6.35mm, the surface hardness is above 40 degrees, the surface treatment has the bright chromium plating, the chromium plating fog and the phosphating.It is used for repairing cars, machines and household articles. If you buy a sleeve, you can match it with it, which is very convenient and labor-saving. We can also use it as a crowbar, because it is very hard and straight.You can't go wrong in choosing it.