Dear madam or sir how are you today, this is irene hong ,come from Shanghai NSJ Hardware LTD.Let me give you a brief introduction of our company. Shanghai NSJ Hardware LTD is a manufacturer specializing in producing dual- caulking guns, dual-cartridges, static mixers . I have looked through your website carefully and found that NSJ has the matching products for you . Besides,now we have cooperated with INDEX , 3M ,SIMPSON, SIKA, ITW, GIRARDIN Whats more ,we have successfully participated many world wide exhibitions, just as; 1) COLOGNE INTERNATIONAL HARDWARE FAIR / PRACTICAL WORLD 2008 2) NATIONAL HARDWARE SHOW in Las Vegas 3) WORLD OF CONCRETE 2010 in Las Vegas we will attend World Concrete in Las Vegas from 18th to 21th this year--2011 So we can assure that NSJ is the best choice for you not only on the quality ,price but also on the services plz contact me and get more details best wishes