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Whip Retaining Hook. Recommended for use with Super Duty or Heavy Duty Whips 8' and longer using a Barrel Spring at the base for best results., A Whip Retaining hook will attach to your vehicle and allow you to secure your whip to your vehicle; and is recommended for Super Duty and Heavy Duty whips 8? with with a spring for bending it down to secure to whip retaining hook which is attached in a location on your vehicle.