Product CatalogueSports and OutdoorsWindsurfing OtherBits and PiecesK4 Fins US Box Blanker Back K4Fins K4 Fins US Box Blanker Product ID: 974814 Brand: K4Fins 2026-09-03 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 Patrik Tube Rod Batten Joiner Chinook SDM Mast Extension Collar And Pin Marlow 4 mm Prestretch Rope Chinook 4.0 mm Spectra Downhaul Rope Chinook Delrin Washer Channelled Chinook Rubber Universal Joint Kit Surf Sail Australia Vent Screw O Ring 10 pack Chinook Rubber Power Joint 8mm with stainless studs Select Fin Box Adaptor Power Chinook Adjustable Collar And Pin For RDM Extension