The Chinook RDM tall carbon ext 46cm mast extension Ultra is probably the most highly regarded extensions on the market. Light weight. Elegant and very strong. New easy to use Composite Snap Collar eliminates lost pins and can be quickly adjusted with one hand. Large brass rollers significantly reduce friction and give easy down hauling. Fully adjustable, easy to use collar, with pin & line. Large finger friendly metal release button – with a good positive action. Highly visible and durable height adjustment markings. High grip clam cleat and quality downhaul rope. Stylish gloss finish.