Expert quality XP1000, patented dual-layer insulated sheath, which makes any damage highly visible. Individually tested to 10,000V, suitable for working on live circuits of 1,000V AC and 1,500V 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. SVCM steel blades hardened, tempered and chemically blackened with precision-machined tip for exact fit to prevent screw damage.