This 6 Piece Extra-Long Electricians Hex Key Set is manufactured from heat-treated and hardened steel with a chemically blackened finish for resistance to corrosion. The keys range in length from 135mm to 215mm and in size from 2.5mm to 8mm. They are fitted with PP/TPR handles, fully insulated to VDE and EN 60900 standards, protecting from electric shocks up to 1500V DC and 1000V AC. This makes them ideal for technicians working on modern hybrid and electrical vehicles (1500V DC safe live working) and for electricians and other trades (1000V AC safe live working). The set is supplied in a storage case and comes with a lifetime guarantee. Contents include: 2.5, 3, 4, 5, 6, 8mm. Net Weight: 0.945kg.