HSH Manual lever Block has such distinct merits as small cubage,light weight,beautiful appearance,small manual force,safety and reliability,and long operational lifespan.It is especially used in occasion without power source such as shipbuilding,post office,mines,electric power,and transportation units in heavy goods suspending,equipment fixing,mechanism traction,and aerial exercise.It can rapidly unhitch brake equipment under unloaded condition,so that the flying hook can remove fleetly.