Medium Pet Door - no more scratched doors. No more getting up late at night. Weather resistant self closing see through magnetic flap. Lockable interior barrier. Fits all walls and wooden doors. For medium size dogs up to 18kg (40lbs). Overall size: 352mm x 294mm (13 7/8" x 11 1/2"). Cut out size: 265mm x 230mm (10 3/8" x 9"). Maximum pet shoulder width: 219mm (8 5/8").