The double hook and swing mechanism design of the car door tread provides two direction locking positions and three levels of tilt, which can provide a more stable connection between the car door sill and the latch. Standing with both feet on the step, trying it out and stretching across the entire roof of my car felt totally safe. Plus, the soft rubber piece is big enough not to pinch or dent the door frame, and the fact that it rotates to lock is reassuring. It also features a foldable durable design, convenient to use and easy to install. Overall, this is a great product design that's better than what's more common at Revain. Worth the price, definitely recommended!