Full floating forged hook jaw for fast ratcheting action. Graduations on hook jaw show approximate size of opening for different pipe sizes. Knurled adjustment nut for easy one-handed operation. Extra large self-cleaning threads. Replaceable, twice hardened alloy steel jaws Precision-milled, based tooth design maximizes gripping and tool life. Large flange prevents nut from being inadvertently rotated when wrench is set down. Wide gripping surface for increased comfort. I-Beam handle allows for maximum strength and minimal weight. Convenient hanging hole for easy storage Enlarge handle end prevents slippage.