QTi Non Sparking, NonMagnetic Double End Ring Wrench Set – 18 Nos consist of 1/4” x 5/16” , 5/16” x 3/8” , 3/8” x 7/16” , 7/16” x 1/2” , 1/2” x 9/16” , 5/8” x 11/16” , 11/16” x 3/4” , 13/16” x 7/8” , 13/16” x 15/16” , 15/16” x 1” , 15/16” x 1-1/16” , 1” x 1-1/8” , 1-3/16” x 1-1/4” , 1-1/4” x 1-7/16” , 1-7/16” x 1-5/8” , 1-5/8” x 1-13/16” , 1-13/16” x 2” , 2-1/16” x 2-1/4” . These tools 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