Features: 1.The door flap was made of ABS material, transparent door, solid door flap is easy for your pet to open. 2.Outer frame adopt acrylic material, safe, smooth surface, sturdy and durable. 3.Four rotation ways, convenient for pet to enter and out. 4.Quick positioning of the magnet, silent brush at door flap side, will not make sounds while using. 5.Can be installed at door or wall, wonderful gift for your lovely dog, cat. Specifications: Material: ABS+ Acrylic Optional Color: black, brown, white Size: Approx. 43x36x5cm/16.9x14.2x2in Installation steps: 1.Use tools: pencil, ruler, cutting pliers, chainsaw, drill, screwdriver, tape measure. 2 In order to convenient installation of dog door, can remove door to install pet door. 3.Cut the paper template along the dotted line position and attach the cut paper template to the door. 4.Then use a pencil to draw a square line 5.Use the drill bit to drill holes in four square corners and drill four holes. 6.Use a wire saw machine with saw blade, insert the hole into a square line to cut, and remove the door plate. 7.Put the door frame inside the pet door into the open door hole 8.Mark the four holes on the door with a pencil 9.Use the drill bit to punch the hole around the marked position to penetrate the door. 10.Put the inner door frame of the pet door into the door hole from below and install the screws. 11.The dog door is installed, then installed the door 12.Installation is complete. Packing List: 1 x Pet inner door 1 x Pet outer door 4 x Screw nut 4 x Screw 1 Bag x Gasket 1 x Instruction