Shutter stop for shutters and shutters in aluminum supplied with frame, allows the locking of the sash in 6 different opening positions between 90° and 160°. Adjustable Cobra is available in kit in the right and left versions (the back is determined by the opening of the sash being inside the building) for C.E.camera profiles (20mm hollow width) centered and decentralized. This system can be applied, through simple processes, both on installed and non installed fixtures. The sash on which it is to be applied must have a width greater than 400 mm, a fundamental requirement for operation.