BronAL Aluminum Bronze Combination Spanner Set 25 Nos – 6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,30,32 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”