a8336db058 Most nuts are between 3.8 and 50 millimetres (0.15 and 1.97in) wide.[6]:pp. The two main categories of protection are passive, with no moving parts, and active, which use springs to keep the gear fixed in place.[6]:pp. Photos Photos My Photo Gallery Photo Galleries Latest Photos Weekly Top 10 Top 200 Photos Photo Articles Help . Most crack climbs are rated between 5.5 and 5.14, where the first "5" indicates that the route is a technical climb (as opposed to a scramble or walking trail), and the second number indicates the difficulty. Each camming device has three or four cams, a shaft, and a trigger mechanism. For example, if the crack is too wide for a fist jam, the climber may press a closed fist against one wall and an open hand upon the other in order to span the width of the crack.[2]:p. ISBN9781575400754. The use of the term "line" as a synonym for "route" derives from this practice, as cracks often form visually distinct lines that can be followed from base to top.[1]:p. 49 Hand cracks are just large enough for the entire hand to fit inside; the techniques for this width are "readily learned and very secure".[1]:p. Contents 1 Widths 2 History 3 Technique 4 Equipment 5 Grading 6 References .
^ "A Guide to the Yosemite Decimal System". Many traditional climbing routes follow crack systems, as they provide natural opportunities for placing protective equipment. For example, 5.13c is easier than 5.13d, both of which are less difficult than 5.14a.[9]:pp. ^ a b c Luebben, Craig (2007). The sizes of cracks vary from those that are just barely wide enough for the fingers to fit inside, to those that are so wide that the entire body can fit inside with all limbs outstretched. Retrieved 21 August 2013. Grading[edit]. Logbooks .
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