If you contemplate using a grappling hook in an outdoors vertical climbing environment (rock or mountain climbing) I can honestly say that a grappling hook would not be worth carrying. There are far more effective items one could carry for the equivalent weight. Despite the movies, it would be extremely risky to climb up a rope secured by a tossed grappling hook. I have climbed for over forty years and volunteered for search and rescue for over twenty, plus some similar job related activities. Use of grappling hook - zero. Times I wished I had a grappling hook - zero.<br><br>In an urban situation, it might work out differently, but the basic problem is you are trusting everything to an anchor whose security you cannot evaluate adequately.<br><br>I would recommend a good set of cams, nuts, and camming devices, along with instruction and practice in their use.<br><br>