This hex key set is not insulated. The plastic handle is yellow. 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 SAE 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 fold-up grip. This hex key set includes one piece.