Mitre clamps or miter clamps clamps are designed to hold mitre joints together.^{[1][2][3][4][5][6][7]}

The earliest mitre clamps are a simple spring in a C-shape with sharpened points that are sprung onto the outside corner of the mitre joint.^{[citation needed]}

In a later design, right angled plates are higher than the screws and the holder.^{[citation needed]} The screws go under the frame (work-piece) to be held, and the bit clamps down on the lower-edge of the frame.^{[citation needed]}

Recent designs are more complicated; a rigid body holds one fixed and one moveable jaw activated by a cam.^{[citation needed]} An example of newer clamps is Jim Chestnut's Clam Clamp.^[8]