Protective Door: Both ends of the door hook fixing door have added plastic protection pads to help prevent scratching and denting of your door..SAFE DESIGN: One-piece design, premium welding process. We have added a nut on the hook. The nut can be locked when the resistance band is hung on the hook to prevent the resistance band from falling off during training, which is more secure..EASY INSTALL: No need to drill holes, clamp it on your door and tighten it by hand to complete the installation. The door hook is suitable for most doors. The gap between the door and the door frame should be greater than 1/8", which is about the thickness of 3 credit cards stacked together. The door anchor can be installed on the top, bottom and sides of the door..HIGH QUALITY: It is made of high-quality steel and can bear 500 pounds, but the strength of your door will determine the maximum load that can be supported. Adjustable to fit all common door thicknesses, adjustment range: 1/2" to 2"..SATISFACTION GUARANTEES: If you are not SATISFIED with our Anchor Gym Door for any reason be free to contact our 24 h-support services. We offer a full refund within 30-Days.