Function: Simplify changing valve springs between rounds. Replace valve springs easily and quickly, remove them from an assembled engine for overhaul or replacement, quickly and easily press to compress the coil spring and then remove the valve seals. Easy to use: The tool is easily disassembled. Use the lever principle: press down to compress the coil spring, remove the valve seals and release them slowly. Finally, remove the valve spring. The handle provides the lever needed to compress even the toughest springs. Valve Spring Compressor Tool with Stud Mount Material: Made of high-strength steel, with anti-rust and anti-corrosion treatment, solid and durable. Its sturdy and durable handle withstands the most extreme pressures of valve springs.