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