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Contact Supplier| Size | M3-M12, or non-standard as request&design |
| Finish | Zinc-plated |
| Head Type | Four claws |
| Material | Carbon steel |
| Grade | 4.8,8.8,10.9,12.9 |
| Standard | GB, DIN, ISO, ANSI/ASTM, BS, BSW, JIS etc |
| Non-standards | OEM is available, according to drawing or sample |