Description Two Bearings: With 2 bearings, the roller can turn easily and will never get stuck, which can prevent the rope from breaking due to excessive friction. Quiet Pulley Wheel: All parts are installed firmly, and the gaskets are placed in the gaps, will not collide with each other and make metallic noise. Loading 500KG: The pulley wheel is composed of 304 stainless steel, and all parts are thickened. It weighs 370g. Self-Locking Nut: 18mm. Compared with general nuts, it can resist loosening and vibration. 360 Swiveling Ring: The pulley block can be rotated 360 degrees to prevent rope from knotting.The maximum rope size is 10mm.