Good morning Sir, How are you It is pleasure to contact you Please allow me to introduce myself and Gem-Duo Co. I am Jonathan, the sales representative of Gem-Duo Co., Ltd.which is the subsidiary of Gem-Year Group, the #1 fasteners manufacturer worldwide in terms of quantity delivered We are located in Shandong Province , China with annual capacity up to 200, 000 tons. We are capable of providing various types of fasteners, especially DIN912, 931, 933 & 934. If you have any needs , please do not hesitate to contact me, thank you very much. Best regards, Jonathan e-mail:***** GEM-DUO CO., LTD No.1 Taoyuan Road, E.D.Z., PingYuan, Dezhou, ShanDong, 253100, ***** China Tel:+86-534-2168533 Fax:+86-534-2168500/2168558