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 2025-01-25 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 Chinook Adjustable Collar And Pin For SDM Extension Ezzy Volcano Surf Sail Australia Rubber Power Joint Boge 10mm Chinook Rubber Universal Joint Kit Surf Sail Australia Vent Screw O Ring K4 Fins US Box Blanker Ezzy Batten Tension Adjuster Streamlined Tendon Joint Surf Sail Australia Mini Tuttle Plastic Cover With Screw Patrik SDM Cambers