Spring Clamp - Types of Clamps - 8 Clamps to Help in Any DIY Project - Bob Vila
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Spring clamps work much like clothespins, but with greater force and stability. They come in many sizes, which are rated by the width of the opening. They are useful in so many applications, not only in the shop, but throughout the house as well. Because they're some of the cheapest clamps to purchase, you can afford to have several in every size.