Ronstan's Series 40 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. Fiddle blocks are ideal for fine-tune mainsheet tackles, cunninghams and other control line purchase systems. The Captive Lock™ universal head can be fixed at 0° or 90°, or left free to swivel and the removable becket pin allows lines to be spliced prior to fitting.
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Specifications
| Bearing type | Ball bearing |
| Bearing material | Acetal |
| Recommended line - Max Ø (mm) | 8 |
| Sheave Ø (mm) | 40 |
| Sideplate material | Nylon |
| Ratchet | No |
| Sheave material | UV stabilised acetal |
| SWL (kg) | 350 |
| NBL (kg) | 1000 |
| Weight (g) | 97 |
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