Adjustable---The adjustment hole spacing is 0.63" (16mm), and you can adjust the width of the door seam according to your pet's size according to your actual needs. Regardless of the type of door frame, the door gap after using the product can be greater than 2.95" (75mm). Multi-scene---Our door finger guards are simple and effective, and are suitable for flat, curved or raised door frames. It can keep ventilated without pinching fingers and allow cats to enter and exit the room, but not for dogs. (Dogs are larger than cats). Why it is necessary---Door finger guard is more convenient than using a pet door and can provide a peaceful space for your cat and dog. Our door finger guard allows cats to enter the room as usual, but prevents dogs from entering and exiting the room or accidentally closing the door. Also prevent babies from locking themselves in the room; prevent toddlers from pinching their fingers. Multi-function---It can be used not only as a door stopper and finger guard, but also as a door restrictor. The door finger guard consists of two parts: the lock hook and the lock lever. Made of PC material, the lock lever has strong elasticity and is not easy to deform or break. No other tools required---Installation only relies on the strong adhesion of acrylic adhesive, no other tools or drilling are required. According to the test, the door finger guards can withstand 55 lbs of impact from inside or outside. Whether from the inside or outside of the door, it is easy for adults to operate the button to unlock with one hand.