Ronstan RF56110 Series 55 RT Orbit Block Single Becket Swivel

Engineered for sailors who demand control, this automatic ratchet block engages under load and releases cleanly when tension drops—perfect for smooth sheet easing and rapid asymmetric spinnaker gybes.
The ratchet delivers unmatched holding power up to 21:1 through a sophisticated NC-machined sheave with Generation 2 patented geometry. Twelve gripping faces bite down on loaded line while straight resistance faces distribute load evenly and protect your rope from wear. Offset face geometry locks the sheet securely in the gripping zone when the pressure's on.
Attachment is hassle-free with the Dyneema Link system—no more hunting for lost shackle pins. Secure moulded retainer keeps one end attached to the block during rigging. Works seamlessly with Dyneema and Spectra strops, webbing, and modern connection points. The moment the ratchet disengages, your sheet runs free and easy.
Built for serious sailors. Built to last.

Specifications:

Up to 20:1 holding power.
Smooth easing of sheets.
Automatic & manual ratchet block.
Integrated becket.

Simple and secure attachment.
Swivel shackle head for unlimited block rotation.
Stainless steel shackle head and compatibility with sharp fixing points.

Sheave Ø 55 mm
Max. Rope Ø 10 mm
M.W.L: 250 kg
B. L: 750 kg
Weight: 86 g