This hex key set has a length of 2.8 mm, 3 mm, 3.2 mm, 3.5 mm, 3.9 mm, 4.3 mm, 4.5 mm, 4.7 mm, 4.9 mm, 5.5 mm, 6 mm, 6.7 mm and is not insulated with an alloy steel handle. 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 15 pieces.