Product CatalogueSports and OutdoorsWindsurfing OtherBits and PiecesK4 Fins US Box Blanker Back K4Fins K4 Fins US Box Blanker Product ID: 974814 Brand: K4Fins 2025-06-02 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 Goya Footstrap Anti Twist Washer Chinook QR Deck Plate No Hardware K4 Fins US Box Blanker Chinook Tendon Joint Chinook Adjustable Collar And Pin For RDM Extension Ezzy Batten Tension Adjuster Select Fin Box Adaptor Bic (Trim) Streamlined Mast Extension Adjustable Collar And Pin Chinook RDM Boom Shim for Pro Front End Marlow 3.8 mm Formuline