TWO BEARINGS: With 2 bearings, the rollers can rotate easily and never get stuck, which can prevent the rope from breaking due to excessive friction. Silent pulley: the components are firmly installed and the joints are placed in the gap, so that they do not collide or emit metallic noise. Loading 500 kg: the pulley is made of 304 stainless steel, and all parts are thickened . It weighs 370 grams. Self-locking nut: φ18 mm. Compared to ordinary nuts, it resists loosening and vibration. 360° swivel ring: The block can be rotated 360° to prevent the rope from tangling. The maximum rope size is 10 mm. Package content: 1 pulley