Name: cat flap Material: ABS material, acrylic door leaf Size: S, M, L (optional) Color: black, pink, brown, white (optional) Delivery color depends on the first main picture Packing method: default box packing Installation process [Detailed description] Step 1: Confirm the installation position of the door opening on your door. When looking for the location, you need to roughly estimate the height of your pet through the door opening (average installation height usually 10-15cm from the ground), use a ruler and pencil along the path Draw the precise cut position on the door with the paper film, mark the cut line on the door and mark the relative positions of the 4 screw holes on the door (i.e. the points of the 4 screw holes on the paper film_) Second step, take the four corners of the dotted line before opening the hole, use a 12mm rotor to make holes in 4 positions, then use a chainsaw to cut your door along the dotted line until the cut door hole extends all the way up and down the door. Third step, before the formal installation of the door hole, first place the cat door hole on the finished door hole and use the actual position and the 4 screw holes drawn before. After that you can install the cat door in the corresponding position and tighten the 4 angle screws, it will be 0K. (If it is a glass door, use a glass tracing tool to gently open it and secure it with glass glue :) Use tools: pencil, ruler, chainsaw, drill, screwdriver, tape measure Detailed size description: Small (S) Exterior dimensions: height 20 cm * width 19.2 cm * thickness 1.5 cm (suitable for installing glass doors and windows) Interior size: interior height 16 cm * width of the interior door 15.7 cm. Use the weight range: 8 kg or less (general recommendation) waist circumference less than 20 cm M (M) Exterior dimensions: height 20 cm * width 19.2 cm * thickness 5.5 cm Interior size: height interior 16 cm * interior door width 15.7 cm Use the weight range: less than 10 kg (general recommendation) waist circumference less than 40 cm Large size (L) Exterior dimensions: height 25 cm * width 23.5 cm * thickness 5.5 cm Interior size: interior height 19 cm * interior door width 18 cm Use the weight range: less than 12 kg (general recommendation) round size less than 60cm Please note: Due to manual measurement, there will be 1-2mm error. Tips from the store: 1. The size is manually measured, please allow the error (1-3cm). 2. Due to the different monitor pixels, there may be some color difference, please refer to the actual product.