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| Manufacturing process | forged | |
| Drive size, square profile | 3/8 inch | |
| Width across flats, for hexagon head screws | 16 mm | |
| External diameter, for hexagon head screws | 21.6 mm | |
| Type of product | socket insert | |
| Material | chromium vanadium steel | |
| Surface | chrome-plated; polished | |
| Standard | DIN 3120 | |
| Overall length L | 64 mm | |
| Drive | square profile | |
| Output drive | for hexagon head screws | |
| Content | single part |
| Article number | 688374 | |
| Catalog number | 637340 | |
| EAN / GTIN | 4000896040131 | |
| Manufacturer number | 880AKF | |
| Article class | 63O | |
| Manufacturer/responsible person | HAZET-WERK Hermann Zerver GmbH & Co. KG, Güldenwerther Bahnhofsstraße 25-29, 42857 Remscheid, Germany, www.hazet.com |