self-locking heavy duty hawk wrenches Our Self-Locking Hawk Wrenches have an immense jaw grip thanks to their ‘Three points of contact’ configuration. We offer the full range of cast iron and aluminium models. Because of the spring loaded jaws, these wrenches actually incorporate a ratchet mechanism, allowing you to leave the tool on the pipe whilst loosening/tightening. ” Powerful triple point grip. Self-locking jaws, no size adjustment necessary. Spring loaded jaws enable a fast, positive ratchet action. High strength, CRV steel jaws prevent slippage.