DETAILS. This Coil Spring Compressor is a tool designed to help you replace the coil springs in your suspension system with ease. Comprised of durable drop-forged carbon steel jaws and heat-treated lead screws, this compressor works by compressing the old springs down and allowing them to be removed. Designed for ease of use, this compressor has a 15/16 inch adjusting nut and can be easily used under a wheel arch.