RockShox Rear Shock IFP Height Tool The Rockshox Fork Rear Shock IFP Height Tool helps to set up the internal floating piston height when doing routine maintenance on RockShox rear shocks. IFP height tools are specific to a series or model of rear shock, and each version is sold separately. Check your maintenance guide to ensure you purchase the right one for your maintenance needs. Specifications: Compatibility: Monarch/Deluxe