This is a Double Swivel Sailing Block (also known as a double sheave marine pulley. Unlike the single-wheel version, this model features two side-by-side sheaves (wheels) within a single composite housing.
Key Advantages
Increased Mechanical Advantage: By routing a rope through multiple wheels, it allows you to build a tackle system (like a 4:1 purchase system) to lift or pull heavy loads with significantly less effort.
Dual Line Capability: It can guide two independent control lines at the same time without them tangling.
360° Swivel Shackle: The heavy-duty 316 stainless steel top rotates freely to prevent lines from twisting and binding under tension.
Common Uses
Mainsheet Systems: Controlling the tension of large mainsails on sailboats.
Boom Vangs & Backstay Adjusters: Providing high-leverage tensioning for heavy sailboat spars and riggings.
Compact Hoisting: Used anywhere a strong, space-saving lifting system is required on a boat or kayak.
Are you looking to use this for a specific sailboat setup, or do you need to know the maximum rope diameter it can accommodate?
Double Swivel Sailing Block with Bow Shackle.
Haifan Rigging supply a range of blocks and pulleys.They come with a variety of fittings for each end to suit your particular application.
To put in your order, just fill out our short inquiry form here, but please do ask us if you need anything custom-made.
If you wish to ask a question or need further advice, you are welcome to contact us.
We look forward to hearing from you!
