Clamps for doors and flaps made of simple nylon with anti- vibration side locks. To close them press the button that creates a flush profile, to open them press the button that comes out by unlocking the little doors and constituting at the same time a gripping knob. The clamp mounting with 2 screws and the ring nut mounting from outside with a hole ? of 26 mm. Clamp structure in nylon, springs in stainless steel. To purchase separately the knob suitable to the thickness of the door.