DBI-SALA Rollgliss R550 Escape Unit - 100 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 DBI SALA Rollgliss R550's bi directional design enables multiple rescues so as one end of