Every insulated hand tool in these kits is rated for exposure up to 1,000 VAC and dielectrically tested at 10,000 VAC. The insulating material used in the tools is impact-resistant and flame-retardant. The two-color insulation makes inspection easier. If the yellow under layer is showing, the tool may no longer be insulated properly and should be replaced or removed from service. These tools are necessary for compliance with OSHA 1910.333, and NFPA 70E. Tools meet or exceed ASTM 1505-07 and IEC 900 Standards for Insulated Hand Tools.