These can crack from improper installation as well. Most transoms are not a 90 degree angle like typical angle stock. When you screw the top down tight and then do the same for the leg on back side, it puts stress on the corner along the length. This will cause it to crack immediately or in a short time. 'L' angle, as it is commonly called, is usually 6061 T6 or 7075 T6 aluminum. They are strong, however, very brittle. Add vibrations of a running engine and will cause all sorts of extra stress. I believe these are to protect edges of transom from being easily damaged.
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