BronAL Aluminum Bronze Allen Key Set – 12 Nos – 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10 mm, 11 mm, 12 mm are Corrosion resistant and is mandantory for working in environments contaning flammable solid, liquids and gases.” &” Aluminum Bronze Hand Tools are Certified for Safety as per IS 4595:1969 2006 Standards and are Torque Tested to IS 6131:1980 Standards. Do not use cheater bars or use external leverage – Misuse not covered under warranty”