For vertical fall arrest protection. Features dual cams for double safety. For use with 1/2" and 5/8" kernmantle rope. Patented design pivots open for easy attachment anywhere on life line. Automatically travels up with user on pre-tensioned life line. Incorporates spring-loaded cams to hold rope grab in parked position. Dual cams for double safety. Conforms to OSHA specifications and ANSI recommendations.