ToolUSA Hand-held Hobby Mini Vise 4": VISE-03064 Overalll length from top to bottom - 4.25 inches - hand holding area is a little less than 2.5" Jaw opens to approximately 1 inch - jaw itself is 1-3/8 inches long Carbon steel construction for dependable use; clamping area has texture for more secure grip Clamp will leave your hands free to do your work With adjustable wing nut closure - turning wingnut opens and closes the jaw