24 Piece 3/8" Drive 12 Point SAE and Metric, Standard Socket and Attachments Set, 1000V InsulatedEach tool is individually insulated to 1000 V and tested to 10,000 V, in compliance to ASTM F1505 standards. Insulation features an orange top insulation layer (orange), and a second layer (yellow) that also serves as a visual safety indicator: should the yellow layer be visible through the outer orange layer, the tool is no longer safe and should be discarded. Gray insulated socket set comes with a light yet durable carrying case with metal latches