material: premium chrome vanadium steel drop forged, entirely hardened and tempered head polished surface finish: trivalent chrome plated to standard ISO 1456:2009 heavy duty double - component handles made according to standard ISO 8976 Advantages: jaw aperture adjustable in 5 positions for dim. 180, for dim. 240 and 300 in 6 positions grooved joint Ergonomic handles With ergonomic handles and a specially designed grip, surface Unior pliers provide maximum comfort at work and high efficiency with minimum strain. Surface protection The pliers are made of excellent steel with special improved composition. Several models come with additional chrome surface protection. High precision With their perfect design and technological superiority, Unior pliers ensure a high precision hold in any instance of general or dedicated use. Profiles Standards DIN ISO 8976 Documentation Double groove joint pliers - 445/1BI