Draper Tools dual-layer insulated sheath, which makes any damage highly visible. Individually tested to 10, 000 V, suitable for working on live circuits of 1, 000 V AC and 1, 500 V DC. Ergonomic soft grip bi-material handle allows free spinning in the palm of your hand to quickly tighten screws, but also allows transfer of torque when needed. Designed with flat sides to prevent them from rolling. SCVM steel blades hardened, tempered and chemically blackened with precision-machined tip for exact fit to prevent screw damage.