in our manufactory, we mainly make stainless steel screws and nut, all of them are 100% stainless steel, we are very responsible for the quality, all of our screws and nuts are certificated by guarantee by the Stainless steel Quality detection center of China. if you like to test them, we will be very assure and acceptable. we make many kinds and many sizes of screws and nuts, not only standard kinds and sizes, but also non standard kinds and sizes. Just if you have your own designs you could advise us to make. Our products are the best quality in Xianlan Town even in Guangdong province, in 2008 Opimlic Game of Beijing main stadium, all of the lamps are used by our stainless steel screws and nuts. Please be remember of that, we do OEM service, please tell me your facourite designs of screws and nuts, we are very pleased to make for you. And please be remember of that, we are manufactory, not trade company, our price are really very competitive! Looking forward to do business with you in near future!