Product CatalogueSports and OutdoorsWindsurfing OtherBits and PiecesK4 Fins US Box Blanker Back K4Fins K4 Fins US Box Blanker Product ID: 974814 Brand: K4Fins 2026-04-20 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 Marlow 3.8 mm Formuline Boge Rubber Power Joint Boge With Stainless Studs Patrik Windsurfer Nose Protector Select Fin Box Adaptor Bic (Trim) Chinook Skinny Adaptor Kit Goya Fin Bolt Rubber Washer Surf Sail Australia Vent Screw O Ring 10 pack Patrik 4.0 mm Spectra Dyneema Downhaul Rope DAKINE Twist Control System Chinook Fin Bolt Neoprene Washer