This hex key set has a length of 3 mm, 3.2 mm, 3.5 mm, 3.9 mm, 4.3 mm, 4.7 mm, 5.5 mm, 6 mm, 6.7 mm and is not insulated with an alloy steel handle. It meets the standards for ANSI B18.3.2M R-2008, ASME B18.3 R-2008, ISO2936:2001 C-2007. In addition, it is made of alloy steel, has a metric measurement type, is corrosion-resistant, has a black oxide finish, plus it is not non-sparking, is not non-magnetic, and is not tether ready with a plain grip. This hex key set includes nine pieces.