Product CatalogueSports and OutdoorsWindsurfing OtherBits and PiecesK4 Fins US Box Blanker Back K4Fins K4 Fins US Box Blanker Product ID: 974814 Brand: K4Fins 2026-07-20 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 Adjustable Collar And Pin For RDM Extension Chinook Rubber Power Joint 8mm with stainless studs Patrik Power Box Box Blanker Patrik Metal Camber Spacer Surf Sail Australia Vent Screw O Ring 10 pack K4 Fins Slot Box Box Blanker 90mm Chinook Adjustable Collar And Pin For SDM Extension Chinook Mechanical Uni Joint Ezzy Split Cam Chinook Skinny Adaptor Kit