DIN7505 Chipboard Screw Ningbo Rock Hardware Co., Ltd. Since 2008 Working with positive attitude, dealing with professional way, living with happy life. Ningbo Rock Hardware hope can bring some new ideas to you about the pleasure work with an interesting company in this heavy metal industry. Company profile Ningbo Rock Hardware was built based on a home office set up in 2008 by Mr. Yongbo Guo....