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 & Benefits: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: 3, 4, 5, 6, 7, 8, 9, 10mm.Supplied on a metal socket rail.Lifetime guarantee*.Model No. AK65601 Specifications: Model No AK65601 Brand: Premier Contents: 3, 4, 5, 6, 7, 8, 9, 10mm Drive: 3/8"Sq Minimum Length: 48mm