Ronstan Series 55 Ratchet Mount Orbit Block - Cheek Anti-Clockwise Rotation

The Ronstan Series 55 Ratchet Mount Orbit Block with Cheek Anti-Clockwise Rotation is a precision rigging component built for sailors and boaters who demand reliable sheet control and holding power in demanding conditions. After years on the water, experienced crew members know that a quality block directly impacts sail trim, crew safety, and overall boat handling—and this Ronstan model delivers on all three fronts. Whether you're racing in competitive waters or cruising with confidence, this compact ratchet block is engineered to manage heavy loads while maintaining smooth, predictable line easing when you need it most.

At its core, the Series 55 delivers up to 20:1 holding power—meaning one crew member can control sheet tension that would otherwise require multiple hands on deck. The ratchet mechanism combines automatic holding with manual override, so you can lock sheets in position instantly or ease them smoothly under full control. The Cheek Anti-Clockwise design ensures the block mounts cleanly on cabin cheeks, rails, and boom-mounted positions without fouling lines or creating snag points. High-performance cleating geometry minimizes slippage while the orbit block design allows natural line lead angles, reducing friction and wear on your sheets. At just 0.2 lbs and measuring 3 × 1 × 6 inches, this block adds minimal weight and windage—critical on performance boats where every ounce matters.

This block excels on mid-sized cruisers, day sailors, and racing yachts where jib sheets, traveler controls, or outhaul lines need confident, repeatable holding under load. The compact cheek-mount design fits seamlessly into existing rigging plans without requiring extensive deck modifications. Installation is straightforward on any boat already fitted with standard block attachment points, and the anti-clockwise ratchet orientation simplifies crew training and reduces load-handling confusion during night sailing or heavy-weather maneuvers. Ronstan's proven durability means this block will perform reliably for seasons of use, making it a sound investment for any skipper serious about deck safety and efficiency.