材质:UL合格之NYLON66（灰色），防火等级94V-2.

用途：此产品可将铁板的螺纹外径由小尺寸转换成大尺寸。

Material: UL qualified NYLON66 (gray), fire rating 94V-2.

Application: This product can convert the thread outer diameter of the iron plate from small size to large size.