Cat Mate 210B Glass Fitting Cat Flap - Brown 4 Way Locking Glass Fitting Cat Flap - The attractive circular styling of this 4-Way locking flap is popular for wooden panel doors in addition to glass and acrylic. It is particularly recommended for single/double glazing and very thin panels/screens to 30mm (1 ¼\") thick. 0-30mm thick. (Note: for existing toughened/double glazing a new glass panel will be required) Easy to use 4-Way lock - Brown with see through flap - Fits doors up to 30mm (1 ¼\") & Double Glazed - 3 Year Guarantee Overall Size: Ø Diameter 245mm (9 5/8\") Cut Out Size: Ø Diameter 223mm (8 ¾\")