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. Double and triple blocks have a swivel shackle head for full 360° rotation.
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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) | 700 |
| NBL (kg) | 1400 |
| Weight (g) | 195 |
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