Working on your classic bike's rear shocks? Removing or installing those heavy coil springs can be a scary, knuckle-busting job. This specialized compressor tool makes it safe and manageable. The set includes two compressors (you MUST use both together for even compression) and four replacement protectors. The thin 13mm wide 'nails' fit into narrow spring coils, and the protectors keep the spring's paint from getting scratched. A rail guide prevents twisting, so the tool works straight and stable. It's designed for manual tools only – use a 3/8\ drive ratchet or a 17mm wrench. NO impact wrenches! Important safety tips: ALWAYS secure the shock absorber itself before you start, and make sure the spring is the right size for the tool. Clean and grease the threads before use for smooth operation. If you're into vintage British bikes, Japanese classics, or any bike with twin rear shocks, this tool is a workshop lifesaver. Do the job right, safely, and without launching a spring across your garage.