Don't waste your money on this. The middle guide rod is weak, which causes the jaw alignment to be distorted when tightened on the object. The central bar is curved so that the jaws are wide on the clamped object and narrow on the empty side of the vise. So it is best to place the object in the middle of the vise. But even then, this vice could only be classified as weak and sloppy at best. I want a refund and an apology from this company.