Ronstan Series 55 Ratchet Orbit Block

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Ronstan Series 55 Ratchet Orbit Block with Single Swivel Head

The Ronstan Series 55 orbit ratchet block is an automatic ratchet block with a fantastic holding power.

This version comes with a single swivel head and shackle.


  • Up to 20:1 holding power
  • Smooth easing of sheets
  • High performance cleating
  • Easily fitted and securely retained Dyneema® Link head
  • Automatic & manual ratchet block


  • Sheave - 55mm
  • Max Rope - 10mm
  • Pin - 5mm
  • Max Working Load - 250kg
  • Breaking Load - 650kg
  • Weight - 82grams

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