QD type double beam overhead crane with hook(5t-650t) Heavy duty overhead crane ranging from A5-A7 Its trolley is bigger and stronger than LH type as the trolley contains motor, reducer and brake separately. And this is the most important factor for working 24 hours per day.Controlled by push button, remote or cabin with VVVF. Forbidden to use in easily combustible, explosive, corrosive and melting metal works.