Features: 1.Great Compatibility — Safely replace brake shoes on heavy-duty tractors and trailers. 2.Upgrade Design — Eliminate makeshift, unsafe methods of unhooking and reconnecting retaining springs when replacing brake spring. 3.Easier Work — Easily and quickly hook the retaining spring loop and press down against the axle. It requires very little effort and makes brake spring jobs much easier. 4.Superior Material — Advanced CNC machined aircraft grade integral steel structure, durability, anti-corrosion and anti-rust. Has good rigidity, high precision and a long service life. .