Manufactured from hardened & tempered Chrome Vanadium steel. Each spanner is fully insulated to VDE & EN 60900 standards to protect from electric shocks up to 1500V DC & 1000V AC. Covers sizes from 8 to 19mm. Ideal for technicians working on modern hybrid & electrical vehicles (1500V DC safe live working). Also suitable for electricians & carpenters (1000V AC safe live working). Supplied in storage case.