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Size: 8 mm | Weight = 50 g / 0.11 lbs; Chrome vanadium steel, open end with anti-slip design will not cause damage to corners of bolts and can work on bolts with up to 50% rounded off corners Box end with spherical gear drive design can be used on various kinds of bolts and nuts such as Spline, 12 point, Square, Star drive, 6 point heads, even 6 point with 50% rounded off corners