Description For use on rails 105-142 lbs. Clamps grip rail head through wedge action. DO NOT USE AS A OVERHEAD CRANE STOP. Do NOT use for impact stops. Wheel blocks can be padlocked for safety purposes. (See PDF attached at bottom of page.) Apply brakes before installing blocks. Use one chock at each end of the car. Use on flat track only. For rail 60-104 lbs., use Item #: 4016-01. Note: Please read the Additional Cautions on the Safe Use tab below. Weight: 50 lbs.
