Ronstan's Series 50 Utility Blocks feature sheaves running on Acetal or Torlon® ball bearings to provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range. Double and triple blocks have a swivel shackle head for full 360° rotation.
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Specifications
| Bearing type | Ball bearing |
| Bearing material | Acetal |
| Recommended line - Max Ø (mm) | 12 |
| Sheave Ø (mm) | 50 |
| Sideplate material | Nylon |
| Ratchet | No |
| Sheave material | UV stabilised acetal |
| SWL (kg) | 800 |
| NBL (kg) | 2000 |
| Weight (g) | 254 |
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