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The Chinook RDG stands for Reduced Diameter Grip - just like the Pro 1 Alloy boom that you know and love, but with a smaller diameter grip. The latest design of the RDG, Chinook reduced the grip diameter another 2mm from Island Surf and Sail's standard small diameter Pro-1 Alloy Booms. To accomplish this yet retain the durability and stiffness Island Surf and Sail's Alloy booms are known for, Island Surf and Sail uses a special tapered tube. This allows Island Surf and Sail to use our new Fiber Composite 2-Pin Adjusting Collars and proven continuous tail-piece, providing stiffness and durability you expect from Chinook. Partly due to the alloy tubing and also a slightly reduced adjustment range, the boom is lighter than other non-tapered booms on the market. The addition of absolute length markings on a 60cm tail-piece aid with rigging your sail properly. Exceptional torsional rigidity and fits both standard and reduced diameter masts perfectly.