The 639 is a simple swivel base for main and jib sheets on very small boats or for control lines on boats of all sizes.
| Height (mm) | 75 mm | Fastener spacing (mm) | 26 mm |
| Weight (g) | 259 g | Fasteners (mm) | 5 FH mm |
| Minimum line Ø (mm) | 3 mm | Maximum working load (kg) | 136 kg |
| Maximum line Ø (mm) | 12 mm |
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