By sandwiching it between the foil mast top plate and the board, you can adjust the base angle of the foil. You can adjust in the following 3 patterns by combining the two types of 0.5° and 1.0°. 0.5° 1.0° 1.5° Combining 0.5° and 1.0° shims results in a 1.5° shim. Compatible with M6 and M8 bolts. Shipping is only available on weekdays. Please be aware if you are in a hurry. We also have other wing equipment such as harness hooks and belts for sale. See my listings here ⬇⬇⬇ #BCWorksウイングフォイル Harness belts and hooks are also ⬇⬇⬇ for sale ⬇⬇⬇ #BCWorksウイングフォイル If you are new to Mercari, you will receive "500 yen worth of points" that can be used next time by using the "referral code" below. ⬇⬇⬇ Referral code is here ⬇⬇⬇ WUADRG Wing foil Wing foil wingfoil foil