Zone 5in Rear Block - 3 Leaf Main is an essential part of any lifting system. This heavy duty, high quality rear block is designed to handle up to 5,000 lbs of weight, making it perfect for any weightlifting setup. It's made with a 3 leaf main spring construction that ensures a smooth and even lift, while its zinc plating ensures a rust and corrosion resistant finish. With its easy installation and lifetime warranty, this rear block is the perfect addition to any weightlifting setup.