The PETOL REFINERY WRENCH is a combination pipe wrench/valve wheel wrench designed for multiple uses in the refining, petrochemical, and gas processing industries. The valve wheel wrench has a specially shaped opening which reduces the chance of slipping when working in overhead or crowded positions. (For light-duty applications only). WARNING! Protect yourself and others from SERIOUS INJURY! Never use a cheater or other means to extend handle! If wrench slips you can be hurt or injure other workers!