They are a plastic foot for your dryer. They screw in. It doesn't get much simpler. However, if you have an old, cheap dryer like the one I inherited. Having all four of the adjustable feet on it makes all the difference. It's a vast improvement from having to stuff things underneath to keep it even.The wholes in my dryer where these feet for were warped.to I hit them with a hammer until the feet would go in straight. So you may be able to do serving similar if needed
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