Rothenberger 18" aluminum pipe wrench made of extremely light aluminum alloy with high-strength. Double T profile, forged hook and jaw, fine-polished teeth set against turning direction, induction hardened, tempered, and anti-slip adjustment screw. Complies with US standard GGG-W-651 Type 1 Class A. Features spring-supported hook for one-handed ratchet-like use, self clamping. Quick preset of tube diameter using scale on hook.