

Powerbox 8/mast sheave box
Offers unparalleled control over your rig! Perfect for quick on-the-fly adjustments, especially in changing wind conditions!
Our Powerbox sheave housing is made from high-quality stainless steel and anodized aluminum, ensuring long-lasting durability even in the harshest marine environments.
This geared box system offers a significant mechanical advantage, allowing you to apply high tension effortlessly. Designed for easy installation at the base of the mast, on a centerboard box, or on the deck.
Manufactured by RWO, each kit comes complete with a 12-position calibration scale and a 4mm line, ideal for adjusting the mast, halyard, shroud or forestay .
Possible adjustments:
- Powerbox Mast: 62mm
- Powerbox 8: 127mm