I love woodworking and a great set of aluminum alloy setting squares can help me get the corners right. They are anodized and clearly marked in centimeters and inches on the outside edges. They are thick enough to resist deformation and allow a clamp to be used. Very nicely made squares; I only wish they were 6 inches, but they were long enough for small woodwork. I recommend these Avanson brand aluminum alloy positioning brackets at 90 degrees. This is a basic, value for money tool. I hope you found the information and my review helpful.