By sandwiching it between the foil mast's top plate and the board, you can give the foil base a 0.5° angle. Compatible with M6 and M8 bolts. Can be used in combination with separately sold 1° and 1.5° shims. We also have sets available for adjustment from 0.5° to 2.0°. #BCWorksWingFoil Shipping is only on weekdays. Please be aware if you are in a hurry. We also have other wing foil accessories such as harness hooks and belts listed. See my other listings here ⬇⬇⬇ #BCWorksWingFoil Harness belts and hooks are also ⬇⬇⬇ listed ⬇⬇⬇. #BCWorksWingFoil If you are new to Mercari, you can use the "referral code" below to receive "500 points" that can be used on your next purchase. ⬇⬇⬇Referral code is here⬇⬇⬇ WUADRG Wing foil Wing foil wingfoil foil