Rope Grab Device : An auxiliary equipment system component; a device used to grasp a life safety rope for the purpose of supporting loads; can be used in ascending a fixed line
NFPA 1983 Standard on Fire Service Life Safety Rope and System Components, 2001 ed. http://www.nfpa.org/assets/files/AboutTheCodes/198 3/1983-F2005-ROP.pdf, (Std: Fr Srvc Life Sfty Rope and Sys Components - Amer) {434 NFC}