For the slim and grim. Ball nuts protect fissures and thin cracks as small as 3mm, while maintaining a breaking strength of 8 kN - specialist but useful in some free climbing circumstances.
Camp Ballnuts are popular in the US for their Aid climbing properties, as they are the only choice for hammerless aid-climbing protection, in thin parallel-sided cracks. When the going gets thin, pull the trigger and place a Ballnut in a crack release the trigger and opposing forces of the brass ball and aluminum nut holds these tiny pieces of protection in place, where they offer an impressive 8kN load protection. Much faster and easier on the rock than banging in a knifeblade, Ballnuts are the last word in protecting thin free climbs and saving time on aid-climbing lines.