※ SUS＃316 不銹鋼面板及滾珠 ※ POM塑膠滑輪 ※ 專門提供 小艇;樂觀型帆船;雷射型帆船 等小船使用 Stainless Steel Ball Bearing provides the good and smooth rotation and polished 316 L Stainless Steel sideplates give optimal maximum working load.