Used more by CRW jumpers, this particular hook knife is larger and easier to grab at nearly double the length (8 Inches). Also often favoured by those jumping in colder conditions as the length on the handle is usually easier to manipulate when hands are cold.
ALL A-License skydivers are required to carry a knife when skydiving \ parachuting.
This is a MANDATORY requirement by the BPA. (Please ensure you get a proper briefing from an instructor prior to jumping with it.)