For professional industrial and home use. Wide capacity jaw (sizes 6-12) allows each tool to work with more fasteners sizes. Wider handles (sizes 6-12) provides more comfort and less stress to the hand. Tension spring stabilizes jaw and knurl adjusts easily. Alloy steel and heat treated. Proportioned dimensions for greatest strength and minimum weight. Chrome plated finish resists rust and corrosion. Polished head and red non-slip cushion grip