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 Chinook Powerhaul Pulley And Cleat System Marlow 4 mm Prestretch Rope Goya Tendon Joint Chinook SDM Mast Extension Cap Chinook Vent Slot Screw Select Fin Box Adaptor Bic (Trim) Surf Sail Australia Vent Screw O Ring 10 pack Chinook Skinny Adaptor Kit Chinook Rubber Power Joint Joint 8mm US Box Blanker