I have just completed 4 16" x 16" cabinets with four of them. All angles are measured square, of course using additional rod clamps to ensure a good connection. I'm in the process of making 2 14" x 16" cabinets and the inside corners were 13" apart causing these inside clamp handles to clash. I deal with this by gluing one side at a time .(see photos) These are quality clips and I will use them often.