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 Fin Bolt Rubber Washer Select Fin Box Adaptor Bic (Trim) Ezzy Batten Tension Adjuster Chinook Mast Cup Kit Patrik GC Tekcam Reduced Cambers Patrik Mast Extension Adjustable Collar SDM Chinook Footstrap Retaining System Patrik Mast Extension Adjustable Collar RDM Patrik Metal Camber Spacer K4 Fins US Box Blanker