Double box wrench

This double box wrench is the non-sparking tools ,it is made of copper-aluminum alloys (Al-Cu)or copper-beryllium alloys (Be-Cu), they are widely used in the dangerous environments with many latent fire and explosion danger , such as petroleum ,chemical industry ,electronics , railway , shipbuilding , gas production and etc. We have both metric and inch size : 5.5*7mm 75*85mm , 1/4*5/16 2-3/8 2-3/4" We 're manufacturer which is speciallized in producing non sparking, special steel and non magnetic tools . All of our tools have passed ISO 9001 and UKAS.Should any of these item be of interest to you please let me know. We will be happy to give you a quotation upon receipt of your detailed requirements.