Product CatalogueSports and OutdoorsWindsurfing OtherBits and PiecesK4 Fins US Box Blanker Back K4Fins K4 Fins US Box Blanker Product ID: 974814 Brand: K4Fins 2026-01-17 From: $14.99 AUD View or buy the Bits and Pieces Windsurfing Other - K4 Fins US Box Blanker from K4Fins to discover other options and shipping details. Description Blanks off US Box when not in use. 130mm top 9 mm wide 25mm deep Back to Windsurfing Other - Bits and Pieces More Bits and Pieces and others in our range Chinook Rubber Power Joint Joint 8mm Patrik Mast Extension Adjustable Collar RDM Chinook Footstrap Retaining System Patrik Power Box Box Blanker Chinook QR Deck Plate Streamlined Quick Connect Deck Plate Goya Fin Bolt Rubber Washer Patrik Tube Rod Batten Joiner Ezzy Sail Keyring Marlow 3.8 mm Formuline