![Windsurf Mast Extension - US Cup - SDM - Aluminum - 28 cm - Chinook](http://windsurfutah.com/cdn/shop/products/Extension-SDM-28cmAluminum-US-Cup-3030h-3030w-091_ee2e8063-ab9a-4b1c-8ffe-5586b819454c_{width}x.jpg?v=1620949303)
The Chinook Sailing Aluminum US Cup-SDM-Medium 28cm Extension uses our new Six Pin collar for easy and solid adjustment. The anodized logo/index markings are one of the many unique and innovative features that make these the most popular extensions on the market. Comes standard with the proven US Power-Haul pulley and cleat system and 2 cm adjustment increments.
- Adds maximum of 28cm to mast length
- Standard Diameter
- US Basecup
- Large brass pulleys for increased leverage
Includes: 1.7m Polyester 4mm Downhaul Rope