Chinook Aluminum Mast Extension - US Base Cup (Standard Diameter)
These Chinook extensions are the SDM version, made to fit standard diameter masts and fit a US 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. The adjustment is via a collar and pin system and is fool-proof.
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.Curious about Chinook products? Learn more about Chinook in our blog post here.