Here are 29 types of clamps that every DIYer should know. What Is a Clamp? A clamp is a device used to constrict, bind, or otherwise press together an object or workpiece. A C-clamp, named for its "C" shape, is one of the most basic clamp styles.
Measure the thickness of the materials you need to clamp and choose a clamp with a throat depth and jaw opening slightly larger than that. Consider the clamping force needed; heavier projects may require larger, heavy-duty clamps.