The Secustik handle is intended for turn and tilt-and-turn windows and French doors. The Secustik handle includes a patented lock mechanism that provides an integrated basic security feature which prevents operating the window locking fixtures from the outside. The coupling between the handle and the operating spindle of the locking fixture enables ‘one-way’ operation, like an electric unidirectional diode that lets current pass in one direction only. In this way it is possible to operate the window handle from the inside only. It cannot be moved by tampering with the locking fixture from the outside. Rotating the Secustik handle by 180° from closed to tilt position, the self-locking mechanism is engaged with an audible click. There are definite positions across the range of handle rotation that are indicated by distinct clicks. The product includes a set of fasteners.