Replacement Accessory: The windsurfing mast plantar joint enjoys high-performance, which are installed on the surfboard through the glue paddle base, and then the sail can be installed on it. Flexible: The base board can be rotated at the joint part, and when the lower end is fixed, the upper end can rotate freely to adjust the direction of the sail. Durable Material: The sail base board is made of PVC, nylon and stainless steel, which feature high strength, sturdiness and durability. Easy Installation: With stainless steel M8 fittings, it is easy to install and not easy to loosen. Applicable Scene: It is suitable for the assembly or maintenance of sailing vehicles and other vehicles, making your sailing more flexible and easy to control. Thread: M8. Colour:Black Material:PVC+nylon+stainless steel Package Contents: 1 pcs x Sail Base Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.