Locking 360 degree swivel base, Jaws with spring loaded clamping action, Heavy duty cast steel construction. Jaws Wide: 2.0″ Jaws opening: 2-3/4″ Clamp opening for table mounting:1-7/8″ Overall Dimension(Jaws closed): 2.5in x 5.75in x7in Size is 50mm – 2 inch