Brackets are nowhere near square. The "walls" that hold the wood taper outward at the top, leaving a large gap at the angle joint when you clamp the two pieces together. I am 100% sure that these are not my cuts, they are clamps. Returned and purchased bessey brand angle clamps (red clamp in picture) for a cheaper price and they are much more accurate. Not worth buying, except maybe for rough construction projects. may be.