Product description：The NLB-600 internal combustion double-head bolt wrench is primarily used for quickly assembling and disassembling nuts on concrete sleeper fastenings. Its core advantage lies in its ability to simultaneously tighten or loosen two nuts at once, with an exceptionally high reverse loosening torque that is powerful enough to handle severely rusted bolts. Additionally, it features rapid on-track and off-track operation; in emergency situations, it can be removed from the track within 10 seconds to 1 minute, ensuring railway traffic safety.