The Silent Duplex Bearing can greatly reduce the friction of the cable pulley and make the cable pulley rotate smoothly and stably. You can hardly hear the sound when it works. The Silent Duplex Bearing can greatly reduce the noise of the cable pulley and make the rotate smoothly and stably. The flat mount pulley is made of quality Carbon Steel and plated on . weight capacity: 170 lb. Widely used in tractive effort of steel wire rope or other rope tools; can be installed on walls, floors, ceilings, ; designed for use with rope or cord in indoor and outdoor applications to hang weight things or lighten load., Manufacturer: Mcnhbdgg