If you are uncertain about whether you need the euro-pin or US-cup style of extension - give us a call at 727.656.6569 so we can help you get the right parts!
Chinook Aluminum Mast Extension - US Cup (Reduced Diameter)
These Chinook extensions are the RDM version, made to fit reduced diameter masts and fit a US base cup style mast foot. The aluminum alloy is lightweight and durable and the EX power-haul pulley and cleat system has oversized brass pulleys to make downhauling easier. Composite Snap Collar system eliminates lost pins or collars and can be quickly adjusted with one hand in 2cm increments. The short size gives you up to 12cm of extension, medium is up to 28cm of extension and long is up to 38cm of extension.