DBI-SALA Rollgliss R550 Rescue Unit - 400 ft.* The DBI SALA Rollgliss R550 Escape Unit offers fast and reliable emergency rescue and evacuation from a wide variety of elevated work areas that require minimal training for added safety. * Fully automatic controlled descent enables fast, safe and effective descent at 2 3 ft. per second with no manipulation required by the user for complete ease of use. * The built in rescue lifting wheel can be used during assisted rescue to slightly raise the