I’ve purchased this edging in 3” and 12” heights; and am using it to form raised vegetable garden beds.
It is strong, is weathering nicely and fun to work with!
The metal warms in the sun adding extra warmth to the soil.
Great for round, oval or free-form shapes- I haven’t tried to make straight or square/ rectangular forms... it may be difficult as the material is sturdy and arrives in coils.