valve spring compressor is designed to help remove and compress valve spring convenient and safe, close the coil spring compressor until touching the center rod, and insert the compressor into the coil spring. The valve spring compressor is used for motorcycle, car, small engine vehicle compression clamp. Durable Material: The valve spring compressor tools are forged from carbon steel, heat treated and coated with black oxide to provide superior strength and corrosion resistance and withstand the stress of your compressed springs.