Product Large Pet Door Specifications Note:External Size: 29.5Cm X 25.4Cm X 5.5Cm(H X W X D);Size Inside: 22.5Cm X 19.5Cm(H X W);Cutout Size: 21Cm X 23.5Cm(H X W);Fit Cats Up To 14.49 Kg (Waist Below 63 Cm);Material: Abs PlasticColour: BlackStyle: FlapWeight: 0.64KgMake Sure The Width And Height (Shoulder Level) Of The Animal Are Less Than The Pet Screen Door, Thanks.The Depth Of The Door/Wall/Window You Are Going To Install Has Better Than The Depth Of 5.5Cm, In Order To Easily Screw In 8 Screws On Both Sides.Read MorePackage Includes Large Car Door: 1 X Large Car Door Cat Flap 16Screws X 8 X Screw Caps Screws 1 X Installation Instruction If The Cat Door Is Too Thick, Please Use Scissors Or A Cutting Machine. Cut To Cut Along The Line In The Width Of The Frame.Read MoreInstallation Instructions1. Trace The Outline On Cardboard Draw The Frame Of The Cat Flap On Cardboard And Cut It Out. Note: You'D Better Prepare These Necessary Tools First: Pencil, Ruler, Electric Saw, Drill, Screwdriver, Double-Sided Tape.2. Trace The Outline On The Door Use A Pencil Drawing Around The Edge Of The Cut Paper. On The Door On Which You Wish To Be Fixed. Note: Generally, The Average Installation Height Is About 10-15Cm From The Floor.3. Drill 4 Corners For The Holes First Drill 4 Corners For The Deep Holes With An Electric Drill.4. Cut A Tunnel Hole Cut The Tunnel Hole With A Power Saw Starting With The Drilled Holes.Read More5. Put The Cat Door In The Door After The Tunnel Hole Is Cut, It Is Best To Wrap It With A Layer Of Wood Skin. And If Your Hole Is A Little Big, That'S It. Necessary Fact.6. Reduce The Depth Of The Tunnel If Necessary If The Cat Door Is Too Thick For Your Door, Use Scissors Or A Machine Cut To Cut Part Of The Tunnel Along Line A Or B. The Cut Scale Is About 2-4 Cm.7. Go Up To The Door Mount The Cat Door With Double-Sided Tape On The Door. 8 Screws Were Removed. Provided For Your Use, Tighten Them With A Screwdriver On Both Sides. Note: 8 Screws For 4 Holes On Both Sides, Screw Them All In 2 Sides As Shown. Above, Please. These 8 Screws Are Designed To Work Together, They Are Not Short.8. Done Put The Caps On. Screw On The Screw Holes, Press It. Installation Is Complete.Read More