' s ▁ch in ▁and ▁lock ▁their ▁hands . ▁As ▁with ▁a ▁sle eper ▁hold , ▁this ▁move ▁can ▁also ▁be ▁performed ▁from ▁a ▁standing ▁position . ▁Another ▁variation ▁of ▁this ▁hold , ▁referred ▁to ▁as ▁a ▁brid ging ▁reverse ▁ch in lock , ▁sees ▁the ▁attack ing ▁wrest ler ▁cr ouch ▁before ▁a ▁face ▁down ▁oppon ent ▁and ▁wrap ▁around ▁one ▁arm ▁under ▁the ▁oppon ent ' s ▁ch in ▁and ▁lock ing ▁their ▁hands ▁before ▁applying ▁a ▁bridge . ▁ ▁Cla wh old ▁Also ▁known ▁as ▁the ▁" ir on ▁cla w ", ▁the ▁cla w ▁involves ▁the ▁attack er ▁g ri pping ▁the ▁top ▁of ▁the ▁head ▁of ▁the ▁oppon ent ▁with ▁one ▁hand ▁and ▁s que ez ing ▁the ▁tips ▁of ▁their ▁fingers ▁into ▁the ▁oppon ent ' s ▁sk ull , ▁thereby ▁applying ▁five ▁different ▁points ▁of ▁pressure . ▁This ▁can ▁be ▁transition ed ▁into ▁a ▁cla wh old ▁S TO ▁or ▁iron ▁cla w ▁sl am . ▁ ▁There ▁is ▁also ▁double - hand ed ▁version ▁sometimes ▁known ▁as ▁a ▁head ▁v ise , ▁the ▁wrest ler ▁performing ▁the ▁hold ▁approaches ▁their ▁oppon ent ▁from ▁behind ▁and ▁g rip ▁their ▁head ▁with ▁both ▁hands . ▁While ▁in ▁the ▁v ise , ▁the ▁wrest ler ▁can ▁control ▁their ▁oppon ent ▁by ▁s que ez ing ▁the ▁tem ples ▁and ▁bring ▁them ▁down ▁to ▁a ▁se ated ▁position ▁where ▁more ▁pressure ▁can ▁be ▁ex ert ed . ▁It ▁was ▁invent ed ▁and ▁used ▁by ▁Baron ▁von ▁Ras ch ke