These rotary knobs are great for framing purposes, but you'll tire of using them on large frames over 20". I have used the knobs on several poster frames that I have sent to customers and the knobs broke during shipping due to the weight of the glass and the backing of the large frames. probably due to the impact or mishandling of the box despite the fragile stickers. The knobs bend very easily and are not a very durable material. After these events I used blue masking tape to secure the knobs to the frame/contents during shipping and have had no problems since. Twist the knobs to create your own frame, and if you intend to hang it at home, you shouldn't have a problem with the product breaking.
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