Premium Quality: The whole set is made of high quality stainless steel, which is higher in hardness than ordinary materials. The material has the characteristics of moisture resistance, acid and corrosion resistance and rust resistance. Its sturdy construction and shock-resistant design make it extremely sturdy. Easy to Use: This 25mm single pulley is ergonomically designed. 360 degree rotation to prevent rope knotting and easy to use. the flexible pulley has a high load capacity and is suitable for a variety of applications, with a load of 150 kg. Suitable for: this silver m25 crane swivel hook designed for indoor and outdoor rope or rope applications, the high-capacity flexible pulley is suitable for a wide range of applications. surface treatment: it is made of stainless steel, the surface is bright and shiny, it does not release toxic substances, it is environmentally friendly, non-toxic and harmless. exquisite treatment: the package includes 6 single pulley rollers. It is super