QTi Non Sparking, Non Magnetic T-Type Allen Wrench/Key Set 6 Pcs – 3 mm,4 mm, 5mm, 6 mm, 8mm, 10 mm are Corrosion resistant and is mandantory for working in environments contaning flammable solid, liquids and gases. Copper Titanium Hand Tools are Certified for Safety as per IS 4595:1969 2006 Standards and are Torque Tested to IS 6131:1980 Standards. Copper Titanium Tools are also certified for safe use in magnetic fields upto 3 Tesla. Copper Titanium Hand Tools are 100% Beryllium Free and are much stronger than Aluminium Bronze Tools. Do not use cheater bars or use external leverage – Misuse not covered under warranty