Big Cat Lock Door, For Pets Up To 25 LB, Allows You To Choose From 4 Access Settings, Open, Locked, In Only Or Out Only, Plastic Frame, Cut Out Size 10- 3/16" Circle, Flap Opening Size 7-1/8"W x 7-1/2"H, Improved Design To Make Installation Easier, Simplified Installation Of Tunnel Support & Core Covers, New Screw Lengths With Binder Posts To Accommodate Most Common Door Thicknesses To Reduce Need To Trim Screws, Added Screw Guides To Make Installing Screws Easier, They Help Align The Screw From The Interior Frame To The Exterior Frame, Updated Installation Manual With Written Instructions, Improved Illustrations, Addition Of Helpful Tips & Replacement Part Information, Redefined Cutting Template For Non-Glass Door Installations To Optimize Cut-Out & Increase Retro-Fit Options Of Our Other Doors, Added Weather Stripping Around Flap For Improved Weather Resistance, Strengthened Locks & Improved Flap.