9031 Adjustable 8224 Waterpump Plier Set, this 2 Piece set are superbly manufactured by Bahco.The 9031 Adjustable Pliers are made of hardened carbon steel with a phosphated finish.They have a 40% wider jaw opening compared to standard wrenches, along with a jaw opening measurement scale.Fitted with a comfort grip handle they are ideal for plumbers.The 8224 Waterpump Pliers, developed according to the scientific ERGO� process, have a one hand operated quick adjust mechanism.The teeth are designed to ensure grip and the jaws for flat and pipe shape gripping.ERGO� handles in two-component combination, thermoplastic surface, for comfortable grip, on tough polypropylene core for rigidity.Material: High performance alloy steel, hardened for extra durability and phosphate finish, anti-corrosion treated. ISO 8976. IP: Industrial Packed.They have single thumb button adjustment with maximum comfort with minimum effort due to the ergonomic design. Suitable for both flat and round gripping,.