Hook KnifeDescription The Ozone Hook knife is the piece of safety equipment you may never need, if you do need it, it may just save your life! The Ozone Hook knife is fairly universal and will fit into most pockets provided in nearly all harness including the Mystic ones. Designed for cutting kite lines quickly, if you get tangled up and the kite powers up the consequences can be dire. The Hook knife cuts lines easily, quickly and safely.