Quantity specification 4 pieces stainless steel sailing boat discs. Flexible sliding disc with high load capacity. Wheel Diameter: 25 mm; Groove Width: 11 mm; Total Height: 45 mm. Maximum Load Capacity This single pulley block is suitable for numerous applications. The safe loading capacity is 400 kg. It is designed for hanging weight items to ease the load. With gravity and skating for lifting. Premium Material Made of high quality stainless steel, lightweight, strong and has a long service life, can be reused. They are corrosion resistant, weatherproof. 360 degree rotation High-performance single disc block with smooth rotary wheel, 360 degree rotation to prevent rope / cable / wire from knotting for your convenient use. Use scenarios - Sailing and rigging: use on deck to hoist sails, adjust lines, and manage tension with reduced effort. The 360 degree rotation helps keep lines organized and reduces tangling during maneuvers. - Workshop or garage lifting: suspend and lift heavy items up to 400 kg, making overhead handling simpler and safer. - Outdoor rope systems: setup tarps, hammocks, or gear in camping or temporary work sites with a tangle-free rope path.