The idea of the hook knife is based around the idea for an inexpensive yet very functional safety knife. This knife was developed for, but not limited to, use by skydivers, Fire/Rescue/EMS, police officers, prison guards, and fisherman. The twin Stainless Steel blades offer a superior cutting surface to help slice through a multitude of webbings and suspension lines. The mouth opening is set small enough however to help prevent cutting one's own finger while handling in an emergency situation. Overall length 6 3/8 inches (16.2 cm). Width is 1 1/2 inches (4 cm). Depth is 1/4 inches (0.7 cm). (Replaceable blades can be purchased separately).