BullDog Winch Pulley Block 7,000lb capacity and up to 3/8 (9.5mm) dia. wire rope. This BullDog Winch Pulley Blockhas a working load limit of 7,000lbs and a 17,0000 lbs breaking capacity,This BullDog Winch Pulley Blockhas a large 4 inch wheel diameterand it has a grease port !TheBullDog Winch Pulley Block Increases your winchs pulling power. Changes direction of your pull without damaging the wire rope.