THIS IS INCORRECT! SINCE THE JAW FACES ARE SMOOTH, NOT SERRATED, THIS WRENCH WOULD BE INCAPABLE OF GRIPPING A PIPE. OR THE FAIRMOUNT TOOL & FORGING CO. THERE IS WHAT LIKES LIKE THE POSSIBILITY OF BEING A STAMPED MARK ON THE SIDE OF THE LOWER JAW (SEE IT CIRCLED IN ‘BLUE’ IN ONE OF THE PHOTOS) BUT IT IS NOT VERY DISTINGUISHABLE AND IT IS LOCATED IN AN ODD POSITION.