With Depets cat door, your cat will be satisfied and love the comfort that the cat door provides, brush bar can reduce energy loss and silent action without disturbing the voice, the cat will not be afraid while wind or snow was locked outside, waterproof and firm, you will be more relaxed at home. Depet medium cat door specifications: outer size: 19.1 cm x 19.8 cm x 5.1 cm (W x H x D), inner size: 15.0 cm x 16.0 cm ( W x H) cut out size: 16.0 cm x 17.0 cm (W x H), fit cats up to 6.8 kg (the waistline less than 38.1 cm), suitable for: up to 50mm thick Material: ABS Plastic Color: White Style: Flap Weight: 0.35kg 4 Way Lock: No On/Off (Fully Locked), In and Out (Fully Open) Only In, Out, Function Instruction of Switches: Turn Red and Green Switches on both sides, Pet will be prevented from entering or leaving the house. Turn the red and green switches to the right side, the pet is allowed to enter the house, but prevent it from coming out of the house. Turn the red and green switches to the left side, the pet is allowed to leave the house, but prevent it from entering the house. Turn the red and green switches to the middle, the pet can leave and leave at any time. Package includes medium cat door:1 x medium cat flap door,8 x screws,8 x screw caps,1 x installation instructions English language not guaranteed). Note There are 8 screws in total, 4 pieces in the front and the rest on the back.