Ratcheting-up the capabilities.
The self-adjusting ratcheting pipe wrenches added to the Proto tool
lineup has no nut; instead, it has a spring-loaded hook jaw that adjusts
its opening to the work size and tightens as the user bears down on the
handle. The jaw is made from forged steel and includes a special tooth
design to tightly grip the work. The spring-loaded jaw keeps the wrench on the work when the worker lets go. A thumb trigger is used for quick
removal. The jaw includes a ratcheting action that allows one-handed
operation. The ratcheting action also means that the user doesn't
need to drag the teeth across the work, so the tool can be used on hex
nuts without rounding the heads. It comes in 10" and 14"
lengths with jaw capacities from 1/2" to 2". The cast iron
handles have a wide gripping surface. Stanley Proto Industrial Tools