Ronstan's Series 40 All Purpose blocks are a great all around solution. Self-lubricating Acetal polymer sheaves running on polished stainless steel races perform equally well with dynamic loads and high static loads. For durability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for cruising and racing. The removable becket pin allows lines to be spliced prior to fitting.
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Specifications
| Bearing type | Plain bearing |
| Recommended line - Max Ø (mm) | 10 |
| Sheave Ø (mm) | 40 |
| Sideplate material | Nylon |
| Ratchet | No |
| Sheave material | UV stabilised acetal |
| SWL (kg) | 400 |
| NBL (kg) | 1000 |
| Weight (g) | 61 |
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