The overall measurement of this Instrument is approximately 7 inches from top to bottom; each blade measures 3 3/8 inches in length. The result? The Instrument opens to an ASTONISHING WIDTH of 2 5/8 INCHES! This Instrument is equipped with a set screw along its side, which ALLOWS THE USER TO LOCK THE BLADE POSITION closed, fully open, or at any point in-between. This instrument is finely crafted for the medical field and is composed of High Quality Medical-Grade materials.