The Rollgliss™ RPD system provides a safe, simple rescue system with features for raising, lowering and positioning during normal work activities. The RPD unit includes a speed sensing lock for added safety and allows you to manually lock off the device once you reach a work level. Well suited for servicing buildings, bridges and dams, as well as within confined spaces. It may be operated by the user or a second standby worker. Pre-rigged for quick and easy installation and use, no special tools, power source or extensive skills needed to operate.