Constructed of lightweight resin with a heavy-duty spring. Ideal for firmly gripping flat or odd-shaped worksurfaces. Jaws pivot for secure, even gripping. Ergonomically shaped handles are designed for comfort & ease of operation. Includes two each of 1", 2" & 3" clamps. Clamp / Spreader Type: Spring Clamp Set; Style: Spring; Opening Size: 1"; 2"; 3"; Spreading Capacity: 1"; 2"; 3".