Professional heat treated Chrome Vanadium steel sockets. S2 Steel hex bits with a zinc phosphate finish. Removes rusted, damaged and severely rounded hex head fasteners with ease. Patented twist design grips tighter as they turn preventing fasteners from rounding. Supplied on a metal socket rail. Features: • One of a comprehensive range of Premier Hand Tools, suitable for daily professional use • Professional heat treated Chrome Vanadium steel sockets • S2 Steel hex bits with a zinc phosphate finish • Removes rusted, damaged and severely rounded hex head fasteners with ease • Patented twist design grips tighter as they turn • Prevents fasteners from rounding • Sizes: 1/4"Sq Drive; 3-6mm, 3/8"Sq Drive; 7-10mm • Supplied on a metal socket rail Specifications: Guarantee:Life Model Number: AK65600