Similar to a finger lock but in wider crack where the whole hand can be wedged to produce a hold. Needs practice but when mastered can be very useful on gritstone routes
A technique where a climber tightly wedges a hand in a crack or fissure in an effort to lock it in place in the hope that she or he can use it as a hold (and not induce an undue amount of pain).
A climbing technique involving insertion of a hand into a constriction and expansion of the hand so that it will not pull out.