Product CatalogueSports and OutdoorsWindsurfing OtherBits and PiecesChinook SDM Mast Extension Collar And Pin Back Chinook Chinook SDM Mast Extension Collar And Pin Product ID: c175 Brand: Chinook 2025-05-25 From: $41.50 AUD View or buy the Bits and Pieces Windsurfing Other - Chinook SDM Mast Extension Collar And Pin from Chinook to discover other options and shipping details. Description Tried and trusted. Fits 46mm extension tubes. Back to Windsurfing Other - Bits and Pieces More Bits and Pieces and others in our range Goya Tendon Joint K4 Fins US Box Blanker Chinook Powerhaul Pulley And Cleat System Patrik Power Box Box Blanker Chinook Mechanical Uni Joint Chinook 4 mm Prestretch Rope Goya Adjustable Collar And Pin For RDM Extension Chinook Webbing Tendon Safety Strap Ezzy Batten Tension Adjuster Chinook Skinny Adaptor Kit