HAND TOOL OF BOLT WRENCH FOR RAILWAY Product Feature NJB-600-1 Sleeper Mechanical Bolt Wrench NJB-600-1/A Sleeper Mechanical Bolt Wrench Reducing the operators labor intensityStrong reverse torque force, max 600N.mStatic Torque design and imported powerful horsepower engineUtilizing the slidable sleeve and safety lock for solving block of screw capFlexible sleeve can alignment automatically, ...