Inner hex bolt,inner hexagon socket bolt, inner hex screw Metric Standard: DIN912 We also could produce un-standard products according to customers'drawings or requirements Class or Grade: class/grade 4.8, 5.8, 6.8,8.8, 10.9 Material: 1. Low Carbon Steel: C1008/C1010/C1015 2. Middel Carbon Steel: C1030/1035/1040/1045 3. Alloy Steel: 40CR Size: M6-M36 Length: 16mm-300mm Finishing: 1. Plain 2.White Zinc Plated : CR3+ , CR+6 3.Yellow zinc plated 4. Black zinc plated 5.Black 6.Heat treatment 7.H.D.G 8.Dacrotized Packing; Normal packing way: bulking in cartons, 25kgs/carton, 36cartons/ wood pallet (900kgs each pallet) Also can pack products according to customers' requirement