The Stone Picker “DUPLEX” is a multipurpose agricultural machinery developed to effectively clear any type of land. The collection of stones is done by dragging the machine moving forward with the tractor in a direct sense, and alternatively may also work as a rear bin, moving in reverse. This machinery is suitable for tractors with power ranging from 40 HP. The frame is structured so that once the connections have been made the masses are distributed so as to prevent the tractor from getting stuck or sliding during operation guaranteeing maximum grip on the ground and minimum tractive stress, significantly reducing fuel consumption; during manoeuvres the weights are balanced and do not affect the tractor bar guaranteeing constant and perfect grip on the ground. The multipurpose working system allows the collection of stones in the direct direction, moving forward with the tractor and dragging forward the bin, also it allows to work in the reverse direction, moving in reverse and using the machinery as a rear bin. The working bin is tilted via a hydraulic system.