NINGBO ZHENHAI JILIAN FASTENER PIECES CO., LTD, one of the leading manufactures in the line of fasteners in China. We can produce standard hexagonal nuts, square nuts, special nuts and the relevant bolts with the super quality! The range is from 1/2 to 2 1/4 the grade from 4.8 to 12.9. The standards can be DIN, BS, IFI, ISO etc.