infinite door check 
The infinite door check (IDC) is a mechanical-hydraulic device designed to hold the door open at any position along its swing path. Traditionally, vehicles equipped with mechanical door checks hold the door at only half- or fully open positions. IDC, by holding the door open at any position, enables customers to protect their own vehicle and avoid denting or chipping the paint of adjacent vehicles in tight parking spaces. The device also allows the occupant to position the door at any convenient position when entering or exiting, even when the vehicle is parked on an incline.

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