BronAL Aluminum Bronze Combination Spanner Set – 11 Nos -1/4” , 5/16” , 3/8” , 7/16” , 1/2” , 9/16” , 5/8” , 11/16” , 3/4” , 7/8” 1” 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”