Small rope clamp/grab for emergencies. So much genius in such a small device! The Tibloc can be a versatile emergency substitute for many rope clamp/grabs as well as self-jamming (prussik) knots. It can be used to set up a pulley system, climb a rope, or haul a second. Ingenious, effective and reliable, it is the essential little "extra" for all lovers of adventure, whether underground or at altitude! For use on single ropes from 8 to 11mm.