We Incorporated Advanced Engineering, For Strength And Ease Of Assembly, With An Attractive Oval Design. No Tools Are Necessary For Installation When Using The Provided Velcro Fasteners. We Also Include Screws For A More Permanent Attachment. Either Way, Kitty Sill Is The Sturdiest Window Perch On The Market. Ul And Cul Listed.

Unheated Kitty Sill 14" X 24" The Sturdiest Window Perch On The Market Ul And Cul Listed