A fast locking device for at least one tool onto at least one guide element suitable for adjusting the position of said device and at least one tool by one hand onto the guide element comprising: - a fixing element provided with at least one first opening for the through-passage of at least one tool; - a base removably lockable to the fixing element, via clutch means, provided with a stop surface, opposite to the fixing element, at an end of which there is a locking element to at least partially engage the guide element; - a hook-like element revolvingly locked to the base via a pin between a release condition and a locking condition for the guide element; - a cursor element sliding internally to the fixing element and to the base and provided with at least one second opening and one hollow which engages a projection present on the hook-like element; - a locking means which internally engages the cursor element and is provided with an inner end that leads to the inside of the first opening and the second opening and in use abuts the tool; - at least one elastic element interposed between the base and the fixing element which counters their mutual approach; said device supporting a release condition in which the device is free from the guide element and from the tool; said device being characterized in that it further supports: - a guide locked condition in which the base is locked to the guide element by means of a first rotation of the locking means driving the cursor element which moves inside the base engaging the protrusion of the element of the hook in such a way that said hook element rotates around the pin forming an obtuse angle with the stop surface allowing to vary the angle of rotation between the base and the fixing element and to move the tool; - a rotation locked condition in which the rotation between the fixing element and the base is prevented by means of a second rotation in the same direction as the first one of the locking means approaching the fixing element to the base until they engage each other, allowing to move the tool; - a tool locked condition in which the tool is locked to the fixing element by means of a third rotation, in the same direction as the previous rotations of the locking means tightening as pack the cursor and the inner end exerting on the tool a force to lock it. - a fixing element provided with at least one first opening for the through-passage of at least one tool; - a base removably lockable to the fixing element, via clutch means, provided with a stop surface, opposite to the fixing element, at an end of which there is a locking element to at least partially engage the guide element; - a hook-like element revolvingly locked to the base via a pin between a release condition and a locking condition for the guide element; - a cursor element sliding internally to the fixing element and to the base and provided with at least one second opening and one hollow which engages a projection present on the hook-like element; - a locking means which internally engages the cursor element and is provided with an inner end that leads to the inside of the first opening and the second opening and in use abuts the tool; - at least one elastic element interposed between the base and the fixing element which counters their mutual approach; - a guide locked condition in which the base is locked to the guide element by means of a first rotation of the locking means driving the cursor element which moves inside the base engaging the protrusion of the element of the hook in such a way that said hook element rotates around the pin forming an obtuse angle with the stop surface allowing to vary the angle of rotation between the base and the fixing element and to move the tool; - a rotation locked condition in which the rotation between the fixing element and the base is prevented by means of a second rotation in the same direction as the first one of the locking means approaching the fixing element to the base until they engage each other, allowing to move the tool; - a tool locked condition in which the tool is locked to the fixing element by means of a third rotation, in the same direction as the previous rotations of the locking means tightening as pack the cursor and the inner end exerting on the tool a force to lock it.