1.Place of origin: Jiangsu,China(mainland) 2.Brand:ZG 3.Standard:DIN912,ISO4762 4.Size:All Grade 12.9 DIN912 ... Soket Head Cup Screw 1.Material:GR1,GR2,GR3,GR4,GR5,GR7,GR9,GR12 ... the Production2. QC department9.Detail Prodicts Pictures: DIN 912 Hex Socket Cap Screw