This new swivelling head ratchet features: Defined lock positions at 0°, 15°, 90° right and left. Pushbutton Release. Fine-pitched tooth design, with small return angle of 5° - 6°. Can be used as a conventional screwdriver at 0°. With the head locked straight ahead the nut can be rapidly spun down the thread, then just click to a comfortable ratchet position to finally tighten up.A real time saver!