The Chinook Sailing Aluminum Euro Pin EX-RDM-Medium 28cm Extension uses custom alloy and bell shaped tubing to provide the best weight to strength ratio available in aluminum construction. The new, easy to use Composite Snap Collar system eliminates lost pins or collars and can be quickly adjusted with one hand. All come with the proven Euro-Pin EX Power-Haul pulley and cleat system and 2 cm adjustment increments.