Two bearings: With 2 bearings, the roller can rotate easily and will never get stuck, which can prevent the rope from breaking due to excessive friction. Silent pulley wheel: All parts are installed firmly, and the joints are placed in the gaps, do not clash with each other and make metallic noise. 500 kg load: the pulley is made of 304 stainless steel, and all the parts are thick. It weighs 370 g. Self-locking nut: φ18 mm. Compared with ordinary nuts, it can resist loosening and vibration. 360° Swivel Ring: The pulley block can be rotated 360 degrees to prevent the rope from tangling. The maximum rope size is 10mm.