Cobra-Water-Pump-Plier-Set-3-Piece-Knipex-00-19-55-S8-p-Knipex-Cobra-reg-Water-Pump-Pliers-are-made-from-chrome-vanadium-electric-steel-which-has-been-forged-and-multi-stage-oil-hardened-for-excellent-durability-The-gripping-surfaces-have-special-hardened-teeth-with-hardness-approx-61-HRC-to-ensure-high-wear-resistance-and-stable-gripping-A-press-button-action-allows-fast-and-firm-adjustment-directly-on-the-workpiece-p-p-The-pliers-allow-fine-adjustment-for-optimum-adaptation-t.